Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e6f6ea5f488df68…

MALICIOUS

PDF

84.6 KB Created: 2021-09-03 20:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 009d3796117445dbf4afda197d0f2f5b SHA-1: cb04052264d7cb1a71058d0d80f32138a88e9195 SHA-256: 0e6f6ea5f488df6816ff640fcdf2a69692da1e53de37e67d9ec7658a142abd56
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting it functions as a link farm to lure users to malicious content. The presence of these links and the nature of the detected heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://nomylo.ru/uplcv?utm_term=timetable+sample+pdf PDF link annotation
    • http://bainihu.com/upfiles/editor/files/zeralekivew.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/279330f745784a0a9bdc4896fea49e1f/rewepojogit.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/ad827efcb24f68787f643a9e599a8954/31308504600.pdfIn PDF document text
    • http://edallyshop.com/upload/files/rozebivozol.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/67925724840.pdfIn PDF document text
    • http://heureka-cz.eu/files/gutimatulibof.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/jenojefobugomu.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/jupizofulafafulesufukiwo.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da368c97d85---89492434651.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e108b550f---zodiwepi.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/jajuvogujus.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/523nhkh9hoi96gr7nlatmj1erb/lawebosiwefuduvar.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/6cab993fac65656fbed9acc1c0fcbc23/73177074336.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/623a76031405f31ff21fc3b00e643b8c/vovimedor.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160803e7e03cee---40378986551.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/nomelodeze.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a6ff94e1e---59649437130.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/zuwusatozatoxubadezi.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/giremiku.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/sokuxew.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a73ea937b4e---juzigejuzomonolaf.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/93854140549.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/puzeva.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/jidofuvudekep.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/geduxusid.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/80741311587.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 17296 bytes
SHA-256: ff8103842c47b84047b6731a786f55184f891e197237f92e79350cf51107daa3
font_02_sfnt_off00012d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3F 10440 bytes
SHA-256: 86f2699d39a6b8efb4003b1733791981c3b35ce13bb902970f8172a8a07ebb4d

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