Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb81518cdfb57b7a…

MALICIOUS

PDF

62.2 KB Created: 2021-06-13 01:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b9d4cce900e13637d74c72b0aceea88a SHA-1: 0462af9222c9c4d3d42386173116d1e912bb0da4 SHA-256: bb81518cdfb57b7a12365428028b02c182e9676880f794a61c4c951c13a3976f
154 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to 'How to setup a wifi adapter for pc', which is likely a pretext to drive traffic to these malicious sites. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or malware distribution tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8151

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 https://krisoc.ru/uplcv?utm_term=how+to+setup+a+wifi+adapter+for+pc PDF link annotation
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/sifkdqnbe10fqmlk1geb12r6cs/zebetadoreditowenigetuko.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/74483748524.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/67c9ab4cff9bc04f6e5018ad2d232b3d/fipazigoganevizilusu.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/2fc7119a0aadfb3a09b518f6c55467c1/dibinijoxelulolisamu.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/237c26cc4a441d58171c153368921170/defop.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/jajupunap.pdfIn PDF document text
    • https://andrejc.si/files/file/farowukuposuta.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9c4d3b7a1914f6ba7992f4631489d406/gobirukuraduputiwu.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/59877f6e713c783ab1707934bc807d2a/rerabukopakogafezapo.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d51d7e614b---51302530340.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/1j9b6kmiv0gdfm53lf43dqrsvs/72031013856.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8a45acf2e---wuxopa.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/zenefufeki.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/8388a3b92d2579fe6b2d185910595b9c/lupigofugojezovanoruk.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b489e1202c9---63604493781.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/b688be288dab032253ddd953747b1953/17474065196.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/niwomiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CE 5172 bytes
SHA-256: 373e0a9ee164c74b16c601bfdf7812b6c534d1a8b80c4f4a40aeea783efc81bb

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