Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a1d3c2a46cc559…

MALICIOUS

PDF

140.0 KB Created: 2021-08-08 05:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f43c9a11b287a9a08b5d838663d052ad SHA-1: 32e5f2ef70c3cb45cdfe00878369bec354e959da SHA-256: 86a1d3c2a46cc559710a477b3e25df73aa243e0b3254028c4a3babaf3c6d38a3
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits multiple indicators of malicious intent, including ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification flagging it as malicious. The document contains a link farm pointing to compromised WordPress sites, suggesting it's designed to host and distribute malicious files. Furthermore, it includes instructions to disable security software and presents a password-protected archive lure, common tactics for evading detection and delivering payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8775

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e18f00e52---58424417137.pdf In PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/2b1e82bcf09c0a0952e39ddecac8f9fb/tetawemubadabalotizala.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/45846117932.pdfIn PDF document text
    • https://mfdesign.hu/files/file/23358757121.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756e2d8fcb4---pepemir.pdfIn PDF document text
    • http://winso.tw/userfiles/file/telikezu.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/xosusufoz.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160802d1f76bda---65382678861.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe7353181f8.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fcacd00d7---maxunorabukodakovo.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/fgqjshed625qhu24ceua4sphcr/45317701980.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee238f0d05---xajunapabokinokelil.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da7349a1c02---56907045858.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ej6e0j81l75l0gbbbsl38l1t17/ponunewuw.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd63797358---9170166282.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c22cb79ee---25405179574.pdfIn PDF document text
    • http://dm288.rs/slicice/file/40145834411.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086e318ca15a---motemitadijezifi.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/vewofurujij.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/34333218339.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/xigabadekojaduzazezixel.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/e690622110c7293385bbe59465d11df2/rawidagegugozoxibe.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/varumifegul.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/61596814189.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/bmdjqht1926oh94u1knu94iagv/fulopemiruxisenonidefo.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/fotuvan.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/7615577610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=wondershare+filmora+youtuber+elemental+effects+pack+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0F8 1676 bytes
SHA-256: 6247598c4edb7cf8862d8f012be1dbd1c6f3e64f6b5dae793dc70e2d340405f0
font_01_sfnt_off0001b8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8E5 19908 bytes
SHA-256: daad2951c6437aa2d5d629eb427b04d046990e8b2afcb0d63ed04f2041ed079e
font_02_sfnt_off0001ecf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ECF6 11408 bytes
SHA-256: 18ef2b36af7efa5f387c08b5976949d2a782c0afa6d26369b59284678b870286
font_03_sfnt_off0002078d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2078D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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