Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c45c603f8457bc…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 08:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 61383781d0e190f5e8751e11db39e0d8 SHA-1: d8f3ca176ef472201df544c8c84d32f1dd8af385 SHA-256: d8c45c603f8457bca030f0fff996febc6e882242b15f09d9444c5374f3bf3192
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The primary purpose appears to be directing users to external, potentially malicious content, rather than containing an active exploit within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/hkk4froi3rmngl1abh7bl6udqh/tiwotobajogobenu.pdf In PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/44286290482.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/e59111c41aa413f2ae1b88d0ded92bd0/tolenadaruzafajerumubugi.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/fobak.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/bajidinomel.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/japanuwenolenovomefug.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210902060430.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134688e172d9---menozoxeloxugima.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed86221f73---988209017.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///vogitobedirakadute.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/zanod.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/80017559351.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/84136022902.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/wemetakopizol.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/gupotebewako.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/p7d8vka95qf8h7piahpurf77s7/86541576747.pdfIn PDF document text
    • http://bptramptour.pl/files/file/newefidapi.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/50854036262.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/dugikozaxutosuwumunub.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/37800486578.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/58437528546.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/monupupuretatelurutole.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161414e6f20cbc---liwozabigewes.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/55967384711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+i+use+my+fingerprint+to+unlock+my+phonePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA52 11288 bytes
SHA-256: 0b151bea755eebc00851f9462b5c42c37acc6485b76f6772200ff19d03837500
font_01_sfnt_off0000f47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C90 18248 bytes
SHA-256: b2a6a100f2681da15d59cd2892be1ec5e2db488decbb4a49bb44a2d373bd3990

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