Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b4064a00d5e554…

MALICIOUS

PDF

81.8 KB Created: 2021-08-30 03:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8db0c4a83c2da2854621fe633dccacfa SHA-1: 932c3d76e6f3de5ac2ddef9b88c2dc40d1132e83 SHA-256: 36b4064a00d5e5546703b563c3436dff1564bde9a423fed7d3556acfcf902b96
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded URLs, such as 'https://crysiq.ru/uplcv?utm_term=free+download+among+us+for+windows', suggest a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://crysiq.ru/uplcv?utm_term=free+download+among+us+for+windows PDF link annotation
    • http://garderoba.sk/images/_file/93786018655.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/84408893257.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ttrefpv3pkb7hrhbmovtkd48g3/gilavemevozomowupa.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec345b292a---26912848931.pdfIn PDF document text
    • http://sowitech.vn/upload/files/83570242682.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/74086655765.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/54289594327.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/31834056496.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b7ed5a37801e8f6dad28c862a8a25ac8/vofatupenobarefuwobele.pdfIn PDF document text
    • http://planetamama.ru/files/file/gedaxuzijataj.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/pojunolab.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/cc46c09bb5638c2749d21413dcb9b6ad/tebavipaz.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/057b8fd0b1b366589d825c05aa00992c/jatenevisabe.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/44967667667.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3b5141e07f---kexewanamavuto.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/jimevum.pdfIn PDF document text
    • https://agermag.ro/mm/file/56545303637.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/boxexufuparun.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160854a7dbc62f---29915305519.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/f181b59bde8fd69f2b7694a874fc24da/nanovemaxef.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/gigowufosafasida.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/1e00e3e76cacb70f0e6c23528c11fb99/40290965594.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/jonuzisivixu.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160916e998a87c---giwudito.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_off0000deeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 10760 bytes
SHA-256: 7340faef0b97dbea0a05f6340d6af9e4c90ba0e9a06b7cba516b104ab64e3377
font_01_sfnt_off0000f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 16084 bytes
SHA-256: 12329d23b7aecd682ee5226dbc99612d5912696ab9d9da8ad7c9e0a76caca75f
font_02_sfnt_off000120e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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