Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4f6915376be933…

MALICIOUS

PDF

90.9 KB Created: 2021-09-05 22:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1dfc4a6eeb660cd177f943d6e4b151ee SHA-1: 21b9cb78252e562d1e3f483d3448dc3995018143 SHA-256: 5c4f6915376be933551f2144cff4d80dddb60c99f14e6d4c6dc676ec772d70cf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm used for phishing. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The document's structure and embedded URLs indicate it is designed to trick users into downloading further malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=sbi+po+prelims+syllabus+2017+pdf+download PDF link annotation
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d870ccd537---logifuwotib.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/tp0g4i6acg5sffu2dak2n3l8pv/11723602241.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1620927501.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/6894020013.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/doroduvuwajavozu.pdfIn PDF document text
    • http://hijoin.hu/editor_up/papogejezinupisorusobuj.pdfIn PDF document text
    • http://leesfeest.nl/leesfeest/sites/default/files/file/xipimo.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cd38df927---busokifojitim.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/39460394383.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609603d2a1bfa---19970761044.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/87c66082d270e02c31c2f69c4c1bd16c/dadolun.pdfIn PDF document text
    • https://buka.ru/sadm_files/liwirigeteb.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109a27406bb2---89411753215.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/74879574697.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/siluvepakopikizefubida.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/vaxunagirogesu.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16123652c6dd3a---36152690868.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/kemipikubojabi.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/be003dd54fcc77b5d8792a76ee88b1f0/pedamefa.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/61749182044.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071993b08913---mavipam.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/55750167927.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608401d4dd795---zeraga.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/33042118828.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_off0000fc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11428 11420 bytes
SHA-256: de54e7e0728a917500ad0e66eeaaf2dc57070df200fae02d2b1817beecf21b05
font_02_sfnt_off00012f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F02 18240 bytes
SHA-256: cc377b32238279b7c7e7800b3d70bc01e78cd976ab5a353bf25bb9b79e473208

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