Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c040a5b7ab46918…

MALICIOUS

PDF

89.6 KB Created: 2021-06-05 05:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f21c40720125141833a777a573499b2 SHA-1: 4548f21d5a0b50ada236f848fc716edfd87d6477 SHA-256: 0c040a5b7ab46918abc302eb7a5cbdc6f2c48f5388ba69283abbd8aa0720c2a0
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms and utilize formcraft plugins for file uploads, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=pokemon+diamond+pearl+gba+rom
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e5f0577f---85883185516.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608595d1ee67b---jofurevexum.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16076eebae00c6---belise.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/30be5e58d4ab0278680a03d2b0455745/latonovefofunebinuzef.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1105b19cc6---fotipipewinewafenalojadiz.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e6f1b49ae29425c219f82398343abfbf/55211289688.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082d5f0decc2---90506199074.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/ddu1gmm0sub9ab2ovc4ravapi4/5520410792.pdf
    • http://fashioneducation.ru/userfiles/file/93291247196.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e04e3a9e2---66342023486.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a321bd43e---vulobelisofora.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a02a554241d5699616db09090ce17cee/saduvi.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/fbd825505583800f30ae8d111c2d902c/19521871928.pdf
    • http://richmediahouse.com/admin/uploads/file/90736666730.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/657d233c728636580b0e15b3e04cf6f3/romedominegutavevamufus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f376.bin
ed143e5d0ef842b77facb22aea661b494c206aed5c582f4225280c2d18ec34f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 5728 bytes
font_01_sfnt_off00010724.bin
3299f20c7eb95e1845a19d6e8480a350ee70bafe601fe5cd326357159937efc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10724 5304 bytes
font_02_sfnt_off00011914.bin
b20972a728c498da1a3740f1ef9baa66168e3ab1b4f4b5b2ebedb4f1d5701fa0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11914 12212 bytes
font_03_sfnt_off000141fb.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x141FB 16092 bytes