Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c2be51b52d3d75…

MALICIOUS

PDF

81.4 KB Created: 2021-07-24 16:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 403d3722042b29993ea111e0918a8a64 SHA-1: 28976a29a4152db94d10030f25fcb9d00644e08d SHA-256: c1c2be51b52d3d75a9229a9ffd9f7e7ef21711c53b9d11bc49c8df41a00a26aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the link farm indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrastone.com/userfiles/files/selorativ.pdf In PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/66923599765.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/16673327917.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/46436710618.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/rifosozobotetefodefizedid.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/26c8f9304ee1c2e87ec5833e3b262764/lekaluzodedimopone.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/lunupufu.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c7a9ecd6a---20482070462.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a036e1d452---16148349072.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbf909f2a8---9915947753.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/vowopefigujipivo.pdfIn PDF document text
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/nuwisimadexofukozavetir.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b925f9f6bb---sazitibififisowewafira.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/70341234851.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/3d92dde89eae05838d44d57b3a42b2cf/16409668709.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/54305397988.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/86bc46ebe90221dd7cb4fb4d13c2b7d8/goboneforibopiwasusuxof.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/jgg0af0sv1sfam7b8ioaqqb9us/39344643048.pdfIn PDF document text
    • https://primer-spb.ru/files/files/5847327447.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/jevigodoxutovolozomeped.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/1024255b478a393f8f738506552b6fa7/26911738060.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/15b962f9c5efb29032a1e8d920711f53/zosuziriz.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/18054344866.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/83057544730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+much+do+davita+employees+makePDF link annotation
    • 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_off0000d95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 11024 bytes
SHA-256: 83b5c99c51966a38a3cb1377194f93846b49dca0c10e612fe9977bafa1f3850e
font_02_sfnt_off00010b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B26 17496 bytes
SHA-256: c2d87cd435281acf2d9ccb962129974718643722e2dd055abd94b1dbb477cceb