Malicious PDF — malware analysis report

Static analysis result for SHA-256 44172aafd9848198…

MALICIOUS

PDF

89.5 KB Created: 2021-07-08 09:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9af834f51916940d064dfe83d6a2943e SHA-1: c5c80588c6942350087fef43c0dd1d950d93fb5d SHA-256: 44172aafd984819893de6e0c3fdd80ecc4b4b1ac9fc904df36b0ab9597d74d15
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. The primary attack pattern involves luring users to these sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160839bf14da2c---50335228498.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/mesckbd0dtssa1u9pjpto5h610/9087957986.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/rjiajl7jot5m6kim6nebtc6dh3/60711326237.pdf
    • http://akademibt.com/resimler/files/julojinuvezumax.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0359a0f62c890aff2c8a17472a7e9bca/55823043989.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608808e2f26c5---52590395613.pdf
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/lulidutoworikunudixomo.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/morc3pjdm5o388fu5hr5ueisn6/14712411338.pdf
    • https://ceccarbotosani.ro/userfiles/file/76096160694.pdf
    • http://mppscstudy.com/admin/usercontent/file/vepudilozezulivelisuru.pdf
    • http://sahamit.net/userfiles/file/98969831246.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0de593cd5---vubisefakes.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/p8m40ccgt80092e5omklrh3lk9/bekapemab.pdf
    • http://3e-machinery.ru/app/webroot/filesfiles/20891386202.pdf
    • http://happinessgown.com/upload/users/files/xefisixibidiwavajunod.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4a9716210---zopufusotuni.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/evopm69h9m0q0o6mf5ii4578sg/jumexokoxe.pdf
    • http://kme-kme.cz/files/file/mimuretoda.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed311ee23e---19831431713.pdf
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/74536187472.pdf
    • http://arci-mp.fr/admin/File/wimudojanekisujarokuduno.pdf
    • http://atut-biuro.com/uploaded/file/10233927575.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094321dcf9d1---8918067182.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da9711a530b---mumenolut.pdf
    • https://altaspin.com/calisma2/files/uploads/93104963311.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=what+is+12+stone+3+in+kg
    • 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_off0000fc9d.bin
d37801087a8cffe049b64a36e79680818015e0db8f71402b6a2f7ca823042e1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9D 16836 bytes
font_01_sfnt_off00012835.bin
fa1c494124a831e4a537133061c29f6bcdf3d7d53b5d4b4e111bcd1c085459f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12835 10672 bytes
font_02_sfnt_off000140cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x140CC 16792 bytes