Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3f6dbb943d1897…

MALICIOUS

PDF

73.0 KB Created: 2021-09-01 19:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20900840b45208cdef777e00055d64d5 SHA-1: 5eb8a30022b23d2bc9dd20d4e1692eb27497cb70 SHA-256: de3f6dbb943d1897fc0371a86b22fb9bd0b4bdf817ec8a942a2ff6c12338ebb6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a tactic of using link farms to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8477

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://pistant.ru/uplcv?utm_term=metrics+and+models+in+software+quality+engineering+pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c04392cb91b---83312545746.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d98694f5b8---55948120636.pdf
    • https://ruedi-leuthold.com/userfiles/files/92756703999.pdf
    • http://misspacificus.com/clients/873634/File/66715398687.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65db8e3705---ruwukela.pdf
    • http://asbufestival.com/uploads/FCK_files/file/48074152654.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/0addda8ec1ce9334e87a3c6f811e3245/78426953182.pdf
    • http://ijdssymposium.eu/upload/45440283815.pdf
    • https://antae.be/app/webroot/uploads/file/guvibulan.pdf
    • http://charivne.info/images/file/gopefunadedirotuzubin.pdf
    • https://wrd13.com/force/file/nadopowa.pdf
    • https://renhedc.com/uploads/files/202108311001567839.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5824692970---fabagip.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/9fe572c63c559e23aa5cabffba71e72c/93632859018.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16095318a7d2e8---35760369792.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/me12n988dij6r6p4glpi89p64j/kodubagomotamizesonuguko.pdf
    • http://ceraunavoltapizzeria.it/userfiles/files/ninafabofepisabikazizefuw.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160cb53805f13f---femifirogejugu.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071588bc1a18---35771429401.pdf
    • http://csc0451.com/userfiles/file/20210612134628_yxnvpj.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4cece4a29---majinekumu.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3fc43f342044819f457a67b848ecfc99/tepuxisawuledodurotese.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716fba59119---51296821446.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a67482f4f3---88577232511.pdf
    • http://interstroy96.ru/uploads/files/bemuxi.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a2.bin
0bfac2376a3150acff32362b5903bf1ce59be341ab8fa17cd6124b238cb57a5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 17336 bytes

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