Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd6998d9ee8a9d38…

MALICIOUS

PDF

85.7 KB Created: 2021-09-01 17:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19e281968fdec4d425345a9e1b684092 SHA-1: c5044cb7badb7f8a5920e2a0afb57c3554f7e96a SHA-256: fd6998d9ee8a9d38e249c39f211b7ca0a5a92d9e62328044e416ab7628e52812
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the presence of external links indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://catamma.ru/uplcv?utm_term=pdf+conversion+to+powerpoint
    • https://gloriouz.in/ckfinder/userfiles/files/86041727878.pdf
    • https://gulfb2b.com/userfiles/file/faxas.pdf
    • http://eko-inwest.eu/upload/file/puxepaxazigepidarobefaweg.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b52795ce46---rizalibuzaji.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/d4a0093f2c0615489f1cd11f90baac13/13895629005.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/be7782101c6dfdaf269ba892dff10cb7/53388997192.pdf
    • https://aedwea.com/upload/foto/mugiwarizi.pdf
    • http://diakmelo.hu/ckfinder/userfiles/files/94587899746.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a266beb900---masuwisosabamoza.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/55572888637.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d898f1dc6a---buzoze.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a162d0098b0---firewodunovex.pdf
    • https://acryl-bg.com/userfiles/file/xumidiwu.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/3asqfetkv1l6mslrj4ite7t4qg/fasupux.pdf
    • http://phuongninhphat.com/uploads/userfiles/file/vavabudute.pdf
    • http://anandtouristcorporation.com/uploads/72720615936.pdf
    • http://ztkammer.at/uploads/file/damosegim.pdf
    • http://ourdesign.hk/ckfinder/userfiles/files/27786492158.pdf
    • http://cyklo-sport-servis.cz/UserFiles/File/46647049186.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51102634595.pdf
    • http://oio.cn/uploadfiles/files/dirivepusopupekadiloboxo.pdf
    • 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_off0000e9f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F3 16792 bytes
font_01_sfnt_off00010205.bin
f053117f81bd3e53beeb340a31a657924d5f308a43d565f1c5e5e3a29a515223
pdf-font-stream PDF embedded font (sfnt) at offset 0x10205 17904 bytes
font_02_sfnt_off00013030.bin
4e393a9292f46b45068e82bbe94d4e3daecc227f703c1694f4d632877374c313
pdf-font-stream PDF embedded font (sfnt) at offset 0x13030 10560 bytes