Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5c33b7f72798a2…

MALICIOUS

PDF

82.4 KB Created: 2021-07-21 23:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cff4a151d8ee13110175a7c1853b0396 SHA-1: 668925e6b67f16c5ca81c067245bc6356076844d SHA-256: 2d5c33b7f72798a2f8ab91706eb4159f756b6781cffa7d38e1fbaeff03587594
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains a link farm pointing to various external URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic of using disposable or compromised hosting for link distribution, common in phishing and malware campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • 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://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/vofutevuvozozirikevusape.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/76c5f345da2447fd31c3825c12391e46/legilazagiluxexo.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3e81a0787d58cb2b5e3ca0ff4b6fc684/13311288992.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/f47285515bdc0fpbh6s8v0ciji/35626870962.pdf
    • http://zetrade.cz/userfiles/file/xemawelugazeketil.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a7a88920369906e2e7ccae68033b47c1/furafipikuv.pdf
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/luzol.pdf
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/5983163401.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d96b2a5398---sidujifod.pdf
    • http://euroinstytut.pl/galeria/file/90951877877.pdf
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/23783634237.pdf
    • http://ahkjt.com/upfile/file/galepelaguzo.pdf
    • http://goldmustang.com/files/files/69804980274.pdf
    • http://93564497.com/userfiles/69630397.pdf
    • https://csn-alliance.com/data/files/gebimefobifiminesu.pdf
    • http://upoart.com/ckfinder/userfiles/files/70884708328.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608746131ccf5---rezusevurog.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b454c85a8f9---sedulore.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/o8vlc6ferca708os6caqdb7kur/35001115184.pdf
    • http://casadiriposomarsala.it/userfiles/files/96362204468.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073761c12cb7---vetutajuvusabekadiwezem.pdf
    • http://starsunited.at/upload/files/zagezagusapukifemizunev.pdf
    • http://csc0451.com/userfiles/file/20210617075114_ndocb7.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=comedic+male+monologues
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddc6.bin
eaaa3455d57e4712f89404b8edf45756c4c7d050551db2c4d843d52f0456bcfc
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC6 17448 bytes
font_01_sfnt_off00010b15.bin
00e05b9d064545bd944d412dda5f70383af0f10834d786c9100ec04f698e0a15
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B15 10644 bytes
font_02_sfnt_off00012335.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12335 16792 bytes