Malicious PDF — malware analysis report

Static analysis result for SHA-256 b088d8b61ee34508…

MALICIOUS

PDF

93.1 KB Created: 2021-06-28 23:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 434b4a61357d46bf6e16df708a1b990e SHA-1: d06dee93abfd8768a0092d1506e53863b91e0157 SHA-256: b088d8b61ee34508e86bd190c5a243ce03dce9fe6b6bbe07609b6334b32aa678
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or redirect users to phishing pages. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The structure suggests it's designed to lure users into clicking links that lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074999ac4463---23022449242.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abb6682024---73768267446.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b55eae41eb1---52414036917.pdf
    • http://fonnepal.org/userfiles/file/24359166628.pdf
    • http://project-lovcen.me/userfiles/file/nupofudat.pdf
    • http://leesfeest.nl/leesfeest/sites/default/files/file/75238574089.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2fcf1102f64a8eef449af4cc747f0a31/80376707408.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/dfdf7f8583ef9d65d17077ed4d0f6b26/gewoxobo.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d3686237a1c---32485813491.pdf
    • http://juha.be/_files/file/lubezewurivagulogasapa.pdf
    • https://creativitagh.com/pevron/www/img/file/wujemu.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd64d336d9---zujakuguzinegovoto.pdf
    • https://bibliothequeanglaise.org/upload/files/nevurajulojebi.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/24b67e868e44574840169390762bfc51/25793950532.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d505ce543---37453690233.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a099163a134---filazimijuxatiberazub.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/eb27b3310eae5a59d6e285c301ac243e/8048045954.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070fa13dd14f---9819883248.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29365d8805---getazilujeretekevemomip.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/u03c0ni9vkf4uaha10f00um1hc/fimeporexadimusiti.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fc7501394---fepuv.pdf
    • https://barcelonamedicalcenter.com/files/galeria/files/82398988943.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0bd09bbc7---kafufokazafosusutasu.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160927a15db6f3---52008616670.pdf
    • http://dj-venci.com/uploads/pages/files/dijodusija.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=big+brother+tyler+and+angela
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f203.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 16792 bytes
font_01_sfnt_off00010a14.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A14 16164 bytes
font_02_sfnt_off00011f8b.bin
c3a47a406ce3ff7c5fe2d539075948504ac0f68b239670b5f337507d3b451a87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8B 10668 bytes
font_03_sfnt_off000137b7.bin
38fdf3823c29d6f37c040c55054e6234928bd0ad4dc825b2a99ba059aca04829		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137B7 18024 bytes

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