Malicious PDF — malware analysis report

Static analysis result for SHA-256 a356fbe8089d58f4…

MALICIOUS

PDF

94.8 KB Created: 2021-09-02 19:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f1c79841cd4a9dcc932356ae0e33bb29 SHA-1: 7b5069867fbb993d949eda948fe4c2e5e7982bfb SHA-256: a356fbe8089d58f491b26b14f9aff3e508977f2afd9c7d2ed192d7ebfa22d889
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The document body is heavily obfuscated and appears to contain metadata from the wkhtmltopdf tool rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://wastran.ru/uplcv?utm_term=fibro+osseous+lesions+of+jaws+pdf PDF link annotation
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922291cce85---3186642582.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/doribeg.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/fda7996f26150401507bdd43ef8f17ae/zilozakimidipilewoku.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210827_135430.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/14275176350.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5686253ef5c7e91fb36a8027c496697a/86859106430.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hh512g9q245uabp5o7ko2dh772/97377300935.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/fc349e03d0f389fe8383e31c1e49ed73/zonise.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/49564262488.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/54087708931.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092483fd0b2a---21307217482.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/nutonarerod.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b441bfdff9c---ginolidusedurar.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/jojapukexiwowomuwudiw.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/41528853346.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f6be473e2f21bdcb8dec692489c40643/74125601858.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/20754410358.pdfIn PDF document text
    • https://tusenfotingen.nu/anvandarbilder/108/files/lewuvilikatemexuxekemobu.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/3a79030f1af72b85b63eb6095a696fd3/30323010771.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/51388945361.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/32529160253.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1e485b1456cfe97805229be3a74f17f1/86615956032.pdfIn PDF document text
    • http://beiks.info/public/file/begisovivigaresewuwuzifel.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/930933bcf6d824b57c03ff9c0e3c8fa1/rixilewawegon.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1A 17888 bytes
SHA-256: c9ce84fe9ef5a9853f12be835fdd427e9018b879cf361e85da7d319983252eb5
font_01_sfnt_off00013c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15492 10828 bytes
SHA-256: 8e3f30c26c1e31f338878b01f1cd5d13054998fab28372a6684fb23eafd18d8d

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