Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f256c05c9a09246…

MALICIOUS

PDF

82.6 KB Created: 2021-08-06 18:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 881abf528531226e68664129de612137 SHA-1: 75840258e2e4f5aaa01ed5e44a89340930d24b13 SHA-256: 2f256c05c9a092463c3453aa4b897d2663f627cdb06c53d2fdc2abf70a944699
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document's structure and the presence of multiple external links indicate an attempt to lure users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=flysim+n%C3%BAmero+de+serial+de+pesca+de+glen+cove PDF link annotation
    • http://naucseto.cz/storage/besukexajo.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/xixolozugi.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/e1b5caeb905338dd4d75bba207ca5812/22947366216.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/tibunefisofotagovotemif.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52b3a34c10---67842293921.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/gojexomuwevalinufuzim.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af2714b3d24---vaziwow.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/27128699461.pdfIn PDF document text
    • http://agriturismofattorialucciano.com/ckfinder/userfiles/files/jisefamodezarabob.pdfIn PDF document text
    • https://red-adlay.com/upload/files/74891120580.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/68336205212.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/somesomepufugituwadularix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4d184801b---warideka.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/9e343a766dbc41d54f289ed772c3c7d8/putemuvuzuwonupevelekek.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/17819851665.pdfIn PDF document text
    • http://e-hane.com/files/85254017251.pdfIn PDF document text
    • http://ridendo.cz/files/file/21568774444.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f93f0c801af---kukiwoxa.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097626160019---61211216455.pdfIn PDF document text
    • http://xibuhuanyu.com/filespath/files/20210804130802.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4f1d4e4ad---bimapivurej.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/a3bb211fefed15d7677983ba48ec45c5/30911348929.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/8e076c97c8dc28d6e1752d01588135ac/26126276507.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4180f960b8---damasuzawuzaweketufulewo.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_off0000d4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E6 11032 bytes
SHA-256: ef625c1128d496fa1ae05c788d228503aae9c6d79878fd6fe3ae15584983b576
font_01_sfnt_off0000ee4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4A 19872 bytes
SHA-256: 093362137f3c8abfd39570643ff4fb4a71eb4af24cf05f58b0e4c60151607d05
font_02_sfnt_off00012132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1