Malicious PDF — malware analysis report

Static analysis result for SHA-256 d30957f30c81360b…

MALICIOUS

PDF

88.1 KB Created: 2021-06-28 00:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 796c13c898d71505a10e43e9328fbf81 SHA-1: 644565c57bee329dc001c2fc9851c20c969b1658 SHA-256: d30957f30c81360b912d0a9793a53f84767d76e563e486a93f8556eddd8b4572
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload directories, a common technique for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16098e006daba2---vujunurowamofegojudani.pdf
    • https://atlastoursntravels.com/userfiles/file/57906859473.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1da01eda9---poxunegogudaxiwe.pdf
    • http://worldofpacifiers.com/editor_uploads/system/files/31967254199.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099c13bc5f6c---zewor.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a55ade421a---77038400876.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ad35abc3c---powegevobesuvuxomeki.pdf
    • http://project-lovcen.me/userfiles/file/gozutarubapusanumo.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/tll558p7qmgh6fa85cuj3vv3p1/77052815624.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ou9mqv5429eiqnk5oeq5ahjvu3/duvinabosugukopiro.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf83059c130---52362863669.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/2944b7820820553e4d3eb5b497dfd551/65807694172.pdf
    • http://homenet-spb.ru/userfiles/file/83927228382.pdf
    • http://nemdanangpho.com/uploads/2021-06-21/images/files/28313106887.pdf
    • http://turhantur.com/turhantur/files/95381746111.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086257535134---podamumopazutoz.pdf
    • http://steelbo.com/uploads/admins/u0/files/20210530025728.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbff639663---nevesitobalupexuwuf.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/c9de8e15adf3e468884f0d738269e048/26579513507.pdf
    • http://unseenadventure.com/userfiles/file/fisolasezuledi.pdf
    • https://gulfsupremesa.com/ckfinder/userfiles/files/99484034422.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=adapted+rubric+for+reflection+paper
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FC 16792 bytes
font_01_sfnt_off00010f13.bin
bc06d968c0e2866d2d92cf063dcfc3aff91b1d99a074990ab8b3fe1c8ce35899
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F13 10664 bytes
font_02_sfnt_off00012758.bin
fd43ca3d14f4676c8ba0e8292979d28b01ece5f0b897c3c845196e611c38fa2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12758 16852 bytes