Malicious PDF — malware analysis report

Static analysis result for SHA-256 2770e60e5eeb3c84…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 05:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ff275e3fcf04034049faacfb66e888ff SHA-1: 6bd4458353ce40f6016f9392731753da01919c3e SHA-256: 2770e60e5eeb3c843e2fae07b2daca79ad428f66b3100a9917754ed032a82738
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting it's part of a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://inwebjor.ru/uplcv?utm_term=redmi+phone+ke+wallpaper PDF link annotation
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t3b5ec340ukmv289135h6sqgh0/gidekof.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613afb1b413e0---muloxosonebixakezezafig.pdfIn PDF document text
    • http://hoaphathotel.com/luutru/files/detekifovewag.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/47396849082.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/bulixafi.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/bivekezitupazebufop.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/vulipud.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/pazobut.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/jepuduwewapi.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/47771069106.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/96477702175.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/27995874784.pdfIn PDF document text
    • http://yongqingtech.com/d/files/vegapezibuxuzexubejatatu.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/tiduromojajuwupiwitazukub.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/tabosuwekoveluvedux.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141b8020921e---daperijiripekikujufosi.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/bivetularoluburag.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df38e6b61e---37655619789.pdfIn PDF document text
    • http://temple.mo/userfiles/file/gitugeko.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/48176500592.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/92998954294.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/59841724423.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF250 10616 bytes
SHA-256: 2fff71d1f881d5dbe24124688d4c119873d89b7c9e1e47c5e6b4bfe8551525f4
font_02_sfnt_off00010a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A57 17464 bytes
SHA-256: 8c0262ac91aba367debdd6d646b5ce678cf88024327877bbf7631058d274dd88

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