Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e3be54d6ee5df6…

MALICIOUS

PDF

84.6 KB Created: 2021-07-08 19:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 74fd31ef8f7a655d2669d0a072d43d75 SHA-1: 4b8e31c2b979dc3e43f265b07389735b1bfa948a SHA-256: f6e3be54d6ee5df6a08f106cb286ae3dcfd3125c117000135ab70f7b37a78e36
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals it functions as a link farm, hosting numerous URLs that point to compromised WordPress upload directories and other potentially malicious sites. The document body is heavily obfuscated and unreadable, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3778

Heuristics 5

  • 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
  • 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://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fcd339f42---13171951875.pdf In PDF document text
    • http://darienhigh70.com/clients/878490/File/84408749634.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a035624079a---dolajavosozod.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/b8f67dffc6d0d656aaf959fb3f3ec087/kobuvodonijuje.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2f426a971---9028887859.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/tewupevalivi.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/87597305600.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608492fdcf618---57983292824.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609194150afd8---xijegolofibazeje.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/1lnuset323ab03gs0qf0u8sca5/nomubuze.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/79250219676.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160aab74f3cb48---revekikiselirobifaxige.pdfIn PDF document text
    • http://greenbrier101.com/userimages/dufobijemitedi.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/cc0786f0c4a1c0fb6da5640ce5180347/24458774073.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad192fdf6f3---68016665323.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/44103474588.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ndi2k6a97uj3td1ajup6blb0dc/pesisirapuzigujeg.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/85406223492.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47bb111da4---33688694040.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/9eb1d39e07c8ce44b7e8336891669586/98929871076.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/0cc02aabd5ca15a33e4e0d554d64c88e/kavajumelikodumifukedulag.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/mowisatewuvaxejori.pdfIn PDF document text
    • http://ciskmv.com/css/file/72495964065.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb64b08ad79---jiseze.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd301a6d6e---14520319380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=fainting+at+the+sight+of+blood+is+calledPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001004a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004A 17012 bytes
SHA-256: 0a1c3e4a67a913cd9de6d6b88dc8ecbbaa3f11887d144ef0faafa86194d316ea
font_01_sfnt_off00012ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA8 10772 bytes
SHA-256: 0dae3ff3f3c108b459ccc97f9d6228bc670356fe2e2f407465fd7bdc4a9db993

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