Malicious PDF — malware analysis report

Static analysis result for SHA-256 37471cd10242cfeb…

MALICIOUS

PDF

88.0 KB Created: 2021-08-21 22:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1a2e26827d174266d50d4e550b576398 SHA-1: 6397657f6c9c7a62bbb880e1568c7bca22a3f991 SHA-256: 37471cd10242cfebb641dfdbb4668fada6b267932efb4d871d3061461c98a3ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://krisoc.ru/uplcv?utm_term=wwe+2k17+mod+apk+download+for+android PDF link annotation
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160775f096e4b3---77375039062.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160abc0a77f160---43719086436.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/pagepodubez.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/17772173043.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/a5b51724a5be46bb3e9ddd3a0bae4307/remefiziwoli.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/ludikemivilasanitawi.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/magareraxokebamikibukup.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/50604910304.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/zetedetom.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/48246817070.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/sozirolaxu.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ib6mkdfakrs1d5ss3u6s7bgdp7/samifinol.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f2ada8672---xipopijopepepatulujutir.pdfIn PDF document text
    • http://smiletoursvietnam.com/ckfinder/userfiles/files/44430663253.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d1c145a4c---55800640313.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/xitakijusenusuz.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/f8660ad3d9833d04d5cb82295a413e17/65470207196.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/66794897416.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/tomisu.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/sajumifomilanutefaw.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/0b002325bd3d469e9e023c2483b4115b/12792516499.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/6423057683.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071f8c812dd8---lekudumofolugotujen.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD688 16260 bytes
SHA-256: 5e4e1f196651c8b9d488671f70ffc2050e4da3af0c48d512fb167fbf68357bf3
font_01_sfnt_off0000ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 19656 bytes
SHA-256: a5deb48b01c5f503efe332e0e07d72648c50bf976878692284d1c43baa537a6d
font_02_sfnt_off00011ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF5 10784 bytes
SHA-256: 0201f4ddf37062416b3c9ea26773d34920163d6f5fadabdac0a1f696261842fd
font_03_sfnt_off000137df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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