Malicious PDF — malware analysis report

Static analysis result for SHA-256 544171fcbb374993…

MALICIOUS

PDF

70.7 KB Created: 2021-08-29 10:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d115ef040ffccbaa13fb625b6c098e51 SHA-1: 6b9abba508eb4e5db07687037806ad3841fd74dc SHA-256: 544171fcbb3749934194b8f420e118e29152ddcaf57b6d9992132e2bc70cf863
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5249

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://nomylo.ru/uplcv?utm_term=genshin+impact+the+chasm+release+date PDF link annotation
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160eca41aabcda---vobibewipusilurum.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/40698867166.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/6dd1534c4ded128c59dd663d75f40d9f/42281727729.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/dab11794bc50487997c97d2e4dd191d8/61267706758.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/pelus.pdfIn PDF document text
    • http://kajsanordstrom.com/userfiles/files/betimonelexijewiduxoj.pdfIn PDF document text
    • https://menu2uplus.com/images/file/84187391155.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/74606458549.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/jiimvud50sinad68agrp468gb4/38446204636.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/1060147553.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/fegofedadafimisowukok.pdfIn PDF document text
    • http://cga82.com/admin/File/kagururukaxupagijudexaban.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3660b96b6---45294465779.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/rifuzovodinalupokawapiv.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e91f56116a2---7524607284.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/ebe60da8c4b448c6d6921d43471d35ae/jiramelovonovav.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/95426480135.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/zavuwi.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/74809923454.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764e37659b7---lozigopubomawaxonasususi.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a69a90777e1---56333090594.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/solubuvuwexunulugurizowuf.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/62973609844.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e66ebca377---73596671325.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/37025186649.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/tisudagulozum.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4F 10700 bytes
SHA-256: 8c62db6ea93a15a51f84de6121de7a6ef0befdc21fc3b6a30c609360487ed86f
font_01_sfnt_off0000f7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1