Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8709cc181421aab…

MALICIOUS

PDF

75.6 KB Created: 2021-06-15 13:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c0dc811fe0cb592e476f1d7cd551667 SHA-1: 4ebfb5562390631012395d6ec36213b86b207fd6 SHA-256: a8709cc181421aab34ba477ee3971fb100e7189081668c9593f135b1763f12de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. No scripts were extracted, but the overall structure and URL findings indicate a likely attempt to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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://coretry.ru/uplcv?utm_term=a+to+z+telugu+movies+free+download
    • https://artenika.pl/fck/file/14238402773.pdf
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/83aebfbd8af0a745c156f557c36b60c9/kewigatosamor.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b00bb3b21f2---vujit.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcce993426b---34606168000.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/1002b8799834c8718dfd9dd155d10651/zoropukafodinigijerikeko.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982f078fdf2---12624733020.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160816cf63d843---dosegipupojepadopobugujo.pdf
    • http://andlupa.com/userfiles/file/78090058078.pdf
    • http://gdbchurch.com/clients/43262/File/57580635963.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608fda2c3674d---kelutobuvo.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bdb0e7182---bilodivi.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/nr5lge2lstun2mogp0ot8qf536/70780159948.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6a9f57926---radadavazepewekatera.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160763895ab996---supipemababaduma.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eacb.bin
fe74c0a9269eb1ecc9bb57013570d55758d73792900c44991c6e5ed5d218e309		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEACB 5416 bytes
font_01_sfnt_off0000fd48.bin
8ee4734758d9cd5c06440d84bf7f3e6ef9f235e2a8010ea7c66837aaefceb7c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD48 10564 bytes

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