Malicious PDF — malware analysis report

Static analysis result for SHA-256 7617d838c6c88fc3…

MALICIOUS

PDF

72.9 KB Created: 2021-05-21 15:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 13b759a3083273992678dd96bf6d10f3 SHA-1: 2351a9e12a65e726eba9e2600c92c561cdcc3ab2 SHA-256: 7617d838c6c88fc3771b50edec6d615b8b234997f1db4787bd59c454b3210efa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress sites, suggesting a link farm or redirection to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though obfuscated, hints at a lure related to downloading audio files, which is a common tactic for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/bfrol8qv90kslu9thbr9fl49l3/fixegasek.pdf In PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083a4f22e8f3---nirido.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/b40ef07aae82c5c3e924faa6eeb7997a/17330754740.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/88877212883.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/7fe825cd91d5597f719ba44f0a6d96c9/81285667141.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/00e19f8c81e460ce6b762eeddacc223f/vusajuvadiluzuxesozipope.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/76210180499.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/np7t5aj7mbolf6rmssabfhbk5h/veguzosixegosovem.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160803606befef---bufezozopedawinekasupo.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/sivolebukizumamepivanaj.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/1ab0f403c7148b57841021f3cb07901d/65785576943.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16084f07c9cbbf---vomosezoziwozebuberopatuk.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/30626233278.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/e7f730c43f0030ae7c2ce4d811134931/soradomurixopi.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/prs317u6mriheb4cl28o3legb4/59526246709.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f9582df53---70219520897.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc662ddd11---maporikis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+download+fb+messenger+audio+filesPDF link annotation
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11B 5420 bytes
SHA-256: a640f05e9fd5e6d4ef5bd899d07415db34e148f4644c366174c24682fdfffb9a
font_01_sfnt_off0000f387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF387 10264 bytes
SHA-256: 14ccc7965a0c58fda0d42ff426031ea67badc9182ed11ea19f45b56cbb862a32