Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3bc5768e291d42…

MALICIOUS

PDF

79.8 KB Created: 2021-06-28 06:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bbccf8b046c8b8d82891b1e3c4d7da60 SHA-1: a7ab9a562531a5756bae09860d5b997bda75b2ab SHA-256: ba3bc5768e291d42236afb0051b6aa8c36281a287a1502b3f5c16ed8bf792f58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of multiple external links points to an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c89d9e25abb4136fd0fdd40378a3092f/27452609012.pdf
    • https://thefencedocumentary.com/adminfiles/file/gixamiku.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3ba88c54bdf6a0ecf6fcdabdec46a239/90962146069.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adb59c75561---50298418764.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/srj5s8ntvrfe1jofbqg2a61ri7/11116710839.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/teriwinixefomis.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a64f311614c---dopor.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b23cd1b18---rinifuxebovozexe.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/071e8bdcc95d329ca33ed58040554586/32422682447.pdf
    • https://chiataiec.com/userfiles/Proj_Name//files/60387700932.pdf
    • http://sequirk.ie/userfiles/file/81066743188.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/cd6dfedbde6ec5497e92d5468b56457a/rururakolus.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/uhp9b4htuflcl2g4qelq2bjsnv/66282134394.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608476c68c4fb---fuwizopuwaguk.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fe938d37b---wotewibevi.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fc92e2710---lofebeparanimitoguruvu.pdf
    • http://astro2sphere.com/admin/images/file/musagi.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c196679cc99---wesonupujisedi.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b334c2c4fd5---ruxemajikepepevutixenux.pdf
    • https://bdsvieclam.com/upload/files/11793510432.pdf
    • http://emmanuelmissionarybaptist.com/clients/74938/File/sodutanafijadejibewed.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b23732d6b6c---22908601994.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/5d93129863b1cb9eb2dcd5a2fd346745/xorijowad.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/e538be4cc7edcac8aed00248b132f288/40747825019.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/4aeeust8v86ugfl04b0vjqivr1/senerejuvunet.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/5c96207f2ae90958abf3f7f0fce6c3f2/mikerujakakugejixis.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+you+insert+a+pdf+document+into+a+word+document
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d673.bin
58a8d5fc14a43f9c015b95c6e6423da10261f18a7867eac34cecb49740d6f6c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD673 11024 bytes
font_01_sfnt_off0000f023.bin
7540f8e5a77d656a4550faa0e96ce3a3b92221a81d16a5f10073548ed9f58b6c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 16000 bytes
font_02_sfnt_off00011954.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11954 16792 bytes