Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ef520aa343407c…

MALICIOUS

PDF

86.9 KB Created: 2021-06-27 05:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19b36d5f6452d0ddfae0f568b2422ad1 SHA-1: 73cb402a9c16c09b0efa853b65df36140e96783f SHA-256: 88ef520aa343407c3482b5869b5c48974f98093185a6db31bc0d3bd162b8aa69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the detection suggest it's part of a phishing or malware distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/8ac2131b59523a0231a128851349e0b4/dunikelezajalupawogenob.pdf
    • http://golden-candies.ru/webroot/files/files/27190338454.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/7dac78bf8d7d3db34c8aa6fdbbc58a18/91232282529.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3b9a5d83e---sonarug.pdf
    • http://acecaalcoy.com/userfiles/file/tovejum.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c260140edd8---30263568291.pdf
    • http://timavoshipsupply.it/userfiles/file/84848879316.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b78522d6ac5---dinewuluzezajim.pdf
    • http://simonide.org/userfiles/file/29601616008.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087849914da7---99200434119.pdf
    • https://lesfeesdelhetre.fr/upload/files/98552972650.pdf
    • http://lasfyy.com/uploadfile/file/20210602224947721.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc13435aaf---83859647989.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a923976b4a5---94855327840.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c21e5db860---kodepufesizivirinun.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/be4dac5aaf9d40d291458d1a93a0af9d/nurigizoxamorizor.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/e7a885a974406856cf17a4adcafae3fc/fetukekidadu.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4430bd127---fefej.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/fc4571efd31f24e1988f13c37304671b/48784789526.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7rfcckcuc8gi7l6o5qqq3kldrr/nerudawulabagijowexasezox.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091a16274466---63731681413.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c220e2492---95285410724.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=like+minded+people+meaning
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d7.bin
5dbeb44d3ade88814155cc506fe601c3a3df7158950e03e852207c0157572c5b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 10420 bytes
font_01_sfnt_off00010814.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10814 16792 bytes
font_02_sfnt_off00012026.bin
797166a021549f2ec01bcc76c59d3e2a2b8f3b079b890daff83c5d53fb74a656
pdf-font-stream PDF embedded font (sfnt) at offset 0x12026 17696 bytes