Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ee6bf696ffa159…

MALICIOUS

PDF

89.5 KB Created: 2021-08-03 17:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f801423ed3c54f734778f297aa64d855 SHA-1: f19abbfae0fb78288be5beafd4aecc6c3fbc990d SHA-256: 28ee6bf696ffa1595dbcea57d11dda39d1a2d42068368f4a06cb0d54da517356
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, which in turn host other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple links to compromised CMS uploads and disposable hosting suggests an effort to obscure the true origin and host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/hnsu7vf90c0luflek5kg3ctlt5/56467903771.pdf In PDF document text
    • http://dharmapremipariwar.org/userfiles/file/50155968473.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de4ab6b9944---78458121022.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/58290715306.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f1ef2ced4c6ca44a0b57c2834ec766a4/pabesexemezadepovibujetow.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3be6772714---texibixaponof.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/83051640414.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/jopike.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/dodap.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/wexorudukalabusez.pdfIn PDF document text
    • https://elektrona.cz/files/file/34309266413.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/fuvipamekibaluwib.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/49737903932.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/26391717562.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/muwasefajulerewoper.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/8385e91a7766c5ef28ba391aa413b549/30877297918.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/ruxowobikomad.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8ef3090b5---79099484166.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/77499508091.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/58718561819.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6068de878ef610b0451cf94463a32948/41420011617.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/5c7349312f1f72e4e59e82c8495e4024/21903270358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=titanic+2+movie+tamil+dubbed+downloadPDF 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_off0000fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 10740 bytes
SHA-256: 2ae9d4a40c3f28e292864b48381642e1bbcc4ce80834f8cdeb41c465041edefc
font_01_sfnt_off00011336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11336 17040 bytes
SHA-256: e2f77ec43cba1746c8a6d87a1ffbadbd6a920c6d6df536c796ea7d001aa4406b
font_02_sfnt_off00013fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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