Malicious PDF — malware analysis report

Static analysis result for SHA-256 c172899d7d785d00…

MALICIOUS

PDF

107.5 KB Created: 2021-06-27 12:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d7b35c91d7d138c413ca38c37d2282e SHA-1: c376415ac539261170b556d1782961ab948e0e95 SHA-256: c172899d7d785d00c03c88ddd8aadb8bfb00eba145e7a40396bdce22f3d09130
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=will+tooth+decay+spread
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3bb66f855---murokafuvezupudem.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6b92cac74---zalezenuputanopeko.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/cvul6t8gc93lsn5t7dclmcmccf/75916262737.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jd15se1o586trc5jmva0qi6827/dukefozeridakizenud.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/1d6783116d7857b963605d90da9defe6/77328066043.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a73b50641d8171d32361fcfeb1b04201/visinojanelanovije.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987f4fc6e37---toxilor.pdf
    • http://heureka-cz.eu/files/mamulufudes.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc6e3b550a---foluvegodexirob.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4067d4982c---guzekugivikobibo.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/bifarakivabijijinax.pdf
    • http://vitanova-cattery.com/upload/file/dutuxoragikejodugi.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607db4b8a9833---83927549772.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6e20713c0---wuvezutusogapuro.pdf
    • https://delphin-restaurant.com/ckfinder/upload/files/xanotu.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/22961d4ecb5c173a5984836323893806/13062114187.pdf
    • https://nikoljski.com/ckfinder/userfiles/files/gamewasazitavilune.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ed01etamd5gf81l6ar8gn6da54/3429072722.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b5ed0b81d0bbed42cb9425301ed6a29d/22660249082.pdf
    • http://zamokugrofa.sk/admin/fckeditor/file/xejizojosanaf.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/6791facab4272e95e259a097720ac2d3/89976436085.pdf
    • http://files.ibiza-ferien.de/file/kikobibedabivumulug.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8ec02a633---dekekokazawakawunovo.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb956caf33f---jaweb.pdf
    • 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_off00014367.bin
27581f0aecf0304821c5573025564ea8a5083d10e92818c832c03b571431c6d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14367 17268 bytes
font_01_sfnt_off00017097.bin
2e99ff11d24796aa6e964366424ffb6c0127133a4a42bd660d9fe0f85c4b1b7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17097 10616 bytes
font_02_sfnt_off00018905.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18905 16792 bytes

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