Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf7c9e5633bd4a1…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 17:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e114592304d6345f9fe1be23b67d9f6 SHA-1: 1087b136c2c255bcf929e348dee39a131b8b4032 SHA-256: fdf7c9e5633bd4a18a0a6819df5a621f86ba62fc8103c6142df4b0afb0be9457
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure suggests it's designed to lead users to malicious content through a network of redirecting URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://heatingboiler.ca/fck_upload/file/21648040433.pdf In PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/9277808642.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/jixizinuvegolimo.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/jinapijelinoseralogaw.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130c4eb7572f---19974694075.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/zaferilimiletuwik.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/0e41c68a4a9ce6cb8079f23f20453732/56243488400.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0584628a4---dikafebogupesosunefibi.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc71170968---xetavewobulubexofuro.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/keropetofap.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/52204476660.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072438a295a5---75469568630.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/fesizemenirewesonosaxezuw.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/37873363744.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/5461a5b5f76f52ff890e6dcf02cf80ea/80854243079.pdfIn PDF document text
    • https://stauber.lt/images/files/17807097635.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c976b1d21ab---wojonurefamomebug.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160982f2882679---ribusuzojesujisip.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1624995342.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/69931bc1c212f0af6802b5776c04c368/37154783273.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/bitikimozepemubifegosupem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=catalogo+generale+bticino+pdfPDF 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_off0000d6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A5 17556 bytes
SHA-256: 4132ffbe2c3ccd2ca3e244aaefb87c9fd50bdeb6c130f9a7190e909be8c70d72
font_01_sfnt_off000104a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A2 10796 bytes
SHA-256: 4301a98c1b8e86fff4c4e5232c45c02af445e959527896f07b199f763c49438c
font_02_sfnt_off00011d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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