Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ba07a1fa129ecf…

MALICIOUS

PDF

88.4 KB Created: 2021-06-28 20:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d9c6ea17028a0746dd78af577c64fa0 SHA-1: 5cb3fa8c6d2f3b9eefbb7dcfe2343bdb31e90cff SHA-256: f6ba07a1fa129ecf40b0d4dea08a16a8f16bcd1c3f8840a90e748fbae2ff5e3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://infrive.ru/uplcv?utm_term=types+of+frosting
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a10742d5e---mewebili.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9ab24ffd74a73b4b3020a8b9bf5168b5/xozorufinawamirala.pdf
    • https://burlingame.com/wysiwygfiles/file/79749518080.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41f94495da---87635278801.pdf
    • https://xanbiente.de/userfiles/file/86207431637.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607da40e3da2f---vakogotik.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0689d021b---nuzugozifikajozaruzakumik.pdf
    • http://php-lounge.de/userfiles/file/25567856891.pdf
    • http://bidmitt.com/img/files/file/tifogafela.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/xomonivitazowaz.pdf
    • https://aterhesseg.com/up_image/file/kifewomoratofekeb.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/15d0fed9935e7388a3de5a86438d3f25/bizidodaxizo.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097c0241b387---50194181555.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091641adbd79---gexuliwijem.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/s6sbi019mpi4fsvrhvoc2fggdr/58752452382.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abc166091e9---69065448000.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/557e9fb8e766a2ad8336476f1ccd7e23/kabitaga.pdf
    • http://aklond.com/UploadFilesfile///2021043001525686.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608803175e7e8---tulan.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/c2fc399951cba0651fbe72fff7ec1087/41055333159.pdf
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/936ddc6b509412dc676b2e69ad5ac9ce/35847981489.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/adb8d7404f237c2da8835599ce024468/luvovefibegirajufeniname.pdf
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/dipafeluxegexabin.pdf
    • 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_off0000f947.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF947 16792 bytes
font_01_sfnt_off00011159.bin
b4f61ab54263853454fd930492fc56860cc534e5368ed7543270c39f3dccfc24
pdf-font-stream PDF embedded font (sfnt) at offset 0x11159 17112 bytes
font_02_sfnt_off00013d00.bin
e4e0ddc7a5b76c9f8297961ca9cdac8f2efe1781e6382a98993072f4a2ea2428
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D00 10404 bytes