Malicious PDF — malware analysis report

Static analysis result for SHA-256 39dd3aba4dd29601…

MALICIOUS

PDF

85.7 KB Created: 2021-06-25 16:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16517d6aa0893dada74bfc326a7c594f SHA-1: 443e815e9597bf9dbd7000df0320839ee4247a61 SHA-256: 39dd3aba4dd29601b00a5ff6db10d8cf936412ff73e2f5db382dcccae2c07891
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to redirect users to malicious content, likely involving a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://akapacha.com/userfiles/file/kikuzajifo.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b488d8cacac---53169280589.pdf
    • http://blueyee.com/upload/file/050857101038.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d04532973e0---xaxivu.pdf
    • http://malagi.pl/user-files/fck/file/38162800703.pdf
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/wakazekawonefizonor.pdf
    • http://rld-carbon.ru/file/96064576653.pdf
    • https://burkina-businessschool.com/business_school/uploads/file/53304663915.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/bhtjv48opdmktif05hopcrl960/munuwozijonomokeromutelaj.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afe9e07e1e---sagerepesubesukuzane.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/9ffd3b1fc4effa96d27b334e2b6f9ee0/83598415063.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80443e8dee---jikilesovobisufiresog.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c4bd09646---ribijototonapowidopowem.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/34il5v8rlpflbfbok89h6mr4q6/wimuwogawetalut.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=cardinal+rules+of+gun+safety+philippines
    • 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_off0000ec09.bin
93f5104c55ae966cb7117ecd3d7334619547d754f2ff6e34b0fd052adc1a6830		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC09 17000 bytes
font_01_sfnt_off0001187e.bin
898a873457e421884100c8f576d2fc7eda10805dcd485bc6ad95fa8c8f93c6de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1187E 11020 bytes
font_02_sfnt_off000131e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131E2 16792 bytes

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