Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca2dfcc97603473…

MALICIOUS

PDF

65.7 KB Created: 2021-06-24 17:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54a5fbd90c40a116532b113d4b2b5691 SHA-1: 0cd5df1747ce936071384a91be48d6885bf8526f SHA-256: 0ca2dfcc97603473566b78ef7c3d54ceeda14e5cbe8d13f5ba97b36ae2a09444
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF also functions as a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories and other disposable hosting. These elements suggest the file is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://semagro-msw.ru/pics/images/file/misoz.pdf
    • http://originalcheck.it/public/img_admin/file/%5C/zebetomawosumunoreroroguj.pdf
    • http://thinhhoanggia.vn/Images_upload/files/96690850770.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160843effc360f---mavodipobeg.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607be182d892b---37170310376.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e325d02d9---tawipe.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b235a3af0c3---46013790484.pdf
    • http://www.findvoters.com/userfiles/file/vewirabem.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9a3f261e8---gikebadob.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/fb2ef4229d9121bf486e7266013d3c6b/7305587419.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/h89obndaco8k1rttj1sgnpviuv/19538110928.pdf
    • https://atphp.ch/userfiles/file/40455923014.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607491e303180---12711319110.pdf
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/78995429120.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c460beef601---85130421889.pdf
    • http://exmar.it/foto_fck/file/rilitobapugimij.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1b80ce70709ed4118e813f314673068b/57539637329.pdf
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/pelexi.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095dd0bdbd7e---13469801097.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=pipe+materials+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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4d6.bin
db7c3a3652c4c7544eb84c1e449d7f7cf0c0e215dd01ee18c0b73476e745d0f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D6 5188 bytes
font_01_sfnt_off0000d65e.bin
a493214c3b9dc139550611c3a339738e39792efa15507e2fc6718218a3a9283f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD65E 10024 bytes