Malicious PDF — malware analysis report

Static analysis result for SHA-256 335d831dae72b681…

MALICIOUS

PDF

87.1 KB Created: 2021-08-14 10:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 26571c2a917e9fe5b4039a5832701e00 SHA-1: 48be463fcb5df75a4c043dd5ad8010501101afdc SHA-256: 335d831dae72b6818250e31d476ec8bab7d38bb4edf54c133bc574b159a2b54f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a fake CAPTCHA lure and a link farm pointing to compromised WordPress uploads. The ML classifier also strongly indicated maliciousness. The document likely aims to deceive the user into interacting with a fake verification prompt, which would then lead to the download of a secondary payload from one of the numerous embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://phanvienphianam.com/uploads/userfiles/file/30894876064.pdf In PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/7qas7vumei7jhtdeqgkfhv7ue0/42121683744.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/wiguzaji.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0e410627b---63180633806.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/sanusiwefud.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089ee52e57a1---18060545065.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/9o2a3d8a177s5ccm476dfek7pt/wosejazen.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/taxedefus.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ikkagcbtf0a4k3qggm0msouto1/37558847049.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c4a23a47c---9917354473.pdfIn PDF document text
    • http://museeducuir.org/upload/files/49341993444.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wusikenav.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/2504100828.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/52520115399.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/mizofagatesuz.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3145c3aed---39009633295.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/diletapisogiw.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/r9cbd1d9kthmiv4sqt8hfcu06v/21233617368.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/wiwuvuwavenubisujifino.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/vularone.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/41729324158.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a7aab82b4---negujagox.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/3f482ce1cd67fb45440b668775f5aaae/sobigawujarowuto.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/tugalemazurifovelutinat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+set+up+your+amazon+author+pagePDF 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_off0000f008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001081f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081F 10912 bytes
SHA-256: 287424919a8b9a355f7b88f75b7d1109b57da7fcb9dfdbce5e9e6b2f25393b3a
font_02_sfnt_off00012150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12150 17192 bytes
SHA-256: 422e3113b4ff761df91dbddebedae1c8d93a8e1acdb95d160c6fe532969b30be

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