Malicious PDF — malware analysis report

Static analysis result for SHA-256 6498f6449fb0798f…

MALICIOUS

PDF

89.4 KB Created: 2021-07-27 21:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a088973310ac2c21ec79c2bea040b6d4 SHA-1: 0f7052806f3efe138877b5353b0a5cf0d073b583 SHA-256: 6498f6449fb0798fd5129026ca818b5467657a6e236dc5c298a0434a66ed03bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as lures to download further malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/v9fvqmjqug3pld3kget92hgf77/40354579269.pdf In PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac16da75984---10330602275.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/6f32014a3155944bfda2af9d75ae7235/75001671819.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/53529141087.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/31fa64142c3a775f77a7492fd64c69cb/90041972867.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/94530258649.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1abaccd965---13731191934.pdfIn PDF document text
    • http://hanauhrova.cz/files/38164266545.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/pevok.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/jaraf.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/bafuketoki.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/zudalimiziliwukel.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/78b70c2534b82be5defb8a59351697a9/35842662251.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/67518508798.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/cphhh7b9u07bh1pihaalrpme07/15360939250.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792dbfecec8---85954921624.pdfIn PDF document text
    • http://ligneus.hu/upload/file/26507356639.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/72989793476.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/jazeputubafejezulusames.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/sufajewebukoka.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7afac9ecc---wutesevajijapo.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/27840743173.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/5309614484.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072a05ce0a26---2306090707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=figurative+language+in+antigone+scene+4PDF 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_off0000f76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7F 17044 bytes
SHA-256: ee36ed69dd5973d8cea177ceef7f4f91a1d12866006d96d41c9ca07906e82657
font_02_sfnt_off00013c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C27 10624 bytes
SHA-256: fd70ddc869c9118a50f5e7419b2d0a5edb08e99222e9bf706ab9992f724c6c82

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