Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fa70f4de219ecc…

MALICIOUS

PDF

86.9 KB Created: 2021-07-01 17:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: baf3be2cfdb481eb9f5a6c941fdb1299 SHA-1: 5d029675bb55b8524693428599984045b2dfedff SHA-256: 79fa70f4de219eccf56b264d92b9f66ad2cd72f949fd8c57eddcb78ddf6ca3d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a focus on driving traffic to external, potentially malicious, sites. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=how+long+can+u+keep+uncooked+chicken+in+fridge PDF link annotation
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cffa6f79def---bajarefag.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecb2e0f46a---bobamakupoweki.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/5553351028.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/a1292d6215f5a1f421368b951a156b6f/85207753502.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bab2d506e---jodelifuwijenamijurogu.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5077c1503---30936943094.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/jmi9ik92kmscluh468bd7do5b2/sonakidugiv.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/69112129700.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bdd16beb7---93681070943.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/72955689003.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/nrsioa19q6aejj2f9tbg0bkd9m/nejugekalegudonabopa.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d879f31a1f---11045289300.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6ff55717b0f8d0793bfcd6bb80f884cd/69993013651.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/sebekexorapemofubow.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/b49e75763d7940d51e465e7a3b124523/5377707867.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da55e53b127---57997044982.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf26b829c6---punevemadetimoraverazar.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/xiwajiwelu.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/benirowatizuxepotarofulip.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/sfp749r08lh4mv6cf6phmu1gk6/fivedamumojojovi.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/11810402585.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/fe745d4b862cd7e99da192c748931369/dupoxomigukalim.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/fuvolaxij.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/nulovigelazotizufinaxe.pdfIn PDF document text
    • 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_off0000f0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 16996 bytes
SHA-256: 4ae10b4afb7949ed05308db71c34c540665888235cfb59ed235c8433beb73b1a
font_01_sfnt_off00011d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13550 10900 bytes
SHA-256: ac7a6fd804392d9cd85965818192052b3084a46d842120566bfe0baf3e51f7e0

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