Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66f82c0edfe688e…

MALICIOUS

PDF

85.1 KB Created: 2021-07-03 12:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1ab34190dd7ffe4617e3d932c0daf48 SHA-1: 03575a3af0d060ac8e084487f56033585c1bc316 SHA-256: e66f82c0edfe688ed65d6f21d24c2a3751b7c632d46e8c86ef6e29b34d2a4d71
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress uploads and other domains, suggesting it functions as a link farm to redirect users to potentially harmful content. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://asesorgubernamental.com/images/file/80983945270.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c30b9841b31---48320469840.pdf
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/zumeluvejajedapijajaxo.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/b85001f12733ae21356e19c35d2dce2e/xajarijewokavizukepop.pdf
    • http://lt101shop.com/userfiles/files/vuwopo.pdf
    • http://aucoindeshalles.fr/menu/file/82518806136.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16217891527615.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/pisupedupefazejemepimo.pdf
    • http://koreanhotpot.com/uploads/files/10110353670.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3965785e9---difab.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/rizaluduvobabog.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a781a979489---51279482243.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607254fc82570---dapagodopevuxavisivew.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/wejube.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/kkge1ojv336ubpbmbbm1tjphp0/19813905632.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/641ce0d8c99c21d5124239d3535828cd/26947386261.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/feontvmv28ohd90kduk7epq9f6/46677973931.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd69c89733---41395367939.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/mb7e4u1ru9nhl5tkt88nmg1hug/malowuxulupezuvefepewudem.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/8b8baid50huhps5lfdph15o2lg/93754085496.pdf
    • https://raiporjai.com/piceditor/file/16312821189.pdf
    • http://go-pxl.com/uploads/files/20448173887.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d611a50260---botizalokanukapowejesepos.pdf
    • http://skogsformedling.se/bilder_umeny/File/69965012831.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609845aad04a0---88065482625.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=invitemanager+bot+discord
    • 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_off0000e87b.bin
8df55d58afc26fe54c5bbd46136396bfa2b5b9e5054cc6534319870835057b98
pdf-font-stream PDF embedded font (sfnt) at offset 0xE87B 16924 bytes
font_01_sfnt_off000114d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114D4 16792 bytes
font_02_sfnt_off00012ceb.bin
77c9df7fa2fdf8093149e22b81d899ba1757faa9beba27935b0c62cf6a1c4730
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEB 10824 bytes