Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a5397c5bab1372…

MALICIOUS

PDF

74.8 KB Created: 2021-09-16 04:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2712a2bf6ab63df186c672c878f30b83 SHA-1: ebf7e18572e65b57569605c68167b97072e3aa26 SHA-256: 84a5397c5bab13721ad5a0d361c6b4bb5c628003fa899b5917bd94898aa06741
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such PDFs to host link farms, likely for SEO manipulation or to redirect users to malicious content. The presence of 'utm_term' in some URLs suggests an attempt to track user engagement with these lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7380

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://pistant.ru/uplcv?utm_term=john+wick+sub+eng PDF link annotation
    • https://pankajplast.com/ckfinder/userfiles/files/12526980155.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/31870006453.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/nusifatasosidol.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/80156244190.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1630510650.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/62919914117.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210908200405_01nnd1.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/20432276317.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/6ornnei95hn7jr4hn5idtqjokm/36269384681.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/114ha3gght66oiup0i9vvncq63/32534172093.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/98755800511.pdfIn PDF document text
    • http://newshop.jp/archive/file/zizuzizuji.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/64832139217.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/74766466072.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/nenaseraxaxegofif.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/77136425539.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/b00f9ecdacd9410c13448acc6a14bd99/dejexoruwezivis.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/30019573451.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/4472619922.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613150e358e9f---nokizutidanerebow.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/92636063208.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/10575913743.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/93934765601.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/35913211330.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161409fd8d2e47---jafuditerixolatoferifa.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ced9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F0 10512 bytes
SHA-256: 4436378ec99a4532bedb29af4a45d6ffb77158c3519726937e8497bdff29e4e9
font_02_sfnt_off0000fede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDE 16712 bytes
SHA-256: 2e4f584f0622edf043da7a60bdee32da51f4a8742a7ebda064cd5258fbceec28