Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3247d437071a356…

MALICIOUS

PDF

92.5 KB Created: 2021-06-30 02:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf65f69c619b4f9c5cb56e76a9053672 SHA-1: 78232fab1c3cafb3ead715cfc6c26a7678a88cf9 SHA-256: d3247d437071a356c64ada6c6ad9800d1b3cb116fed6c29eb212df999ddca16c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, which are commonly used for phishing or distributing further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/scoiaql35s8495lnlm8vjgtrd0/92929780760.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/93120c19c7597288b7a87acc12c26385/jemadepotus.pdf
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/34902530049.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cb3956204---bimewuxakerebapagija.pdf
    • http://obasekiestates.com/UserFiles/file/31853627448.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/ece84298afb04342ebeeea65c8b3dfd9/firoviwogixul.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/fe2ccddf49f57f0dd0eea52f5e5ca5b9/bapuvuzala.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/57f11c7511cf884192482b906f4198bd/lilemogupemigamijis.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ddff122f5---rotitokoref.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf4e4d1727b---77395254265.pdf
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/gazakigi.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16085c8bfd98b5---51577654286.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/diretabaza.pdf
    • http://sinproval.it/userfiles/files/84560576975.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc34e6b3566---duwegumates.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608b67b37e195---71688126343.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607348812585d---94787363617.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/vtbr9klfq5t8rpc7bl2e4a1cv5/pawetar.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b5984c972c9---98093100834.pdf
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65314403745.pdf
    • http://enotecagaribaldi.it/userfiles/files/ratifuwarojuxef.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f28437c9aa---zuxugejetanusimunajum.pdf
    • http://ahxxzx.com/userfiles/202106/file/19852930474.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c165482ac39---44989782173.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=anxious+avoidant+personality+traits
    • 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_off00010629.bin
9ff0b44ff54a3038cedd661665d6a413ce5587ff8c81a5967de2e1d7d8aa2195
pdf-font-stream PDF embedded font (sfnt) at offset 0x10629 17396 bytes
font_01_sfnt_off000133b7.bin
01456e5f3feffa5db5a6d3eb483654820d2e93bbb80be45dd2dcf9df716ca430
pdf-font-stream PDF embedded font (sfnt) at offset 0x133B7 10748 bytes
font_02_sfnt_off00014ca9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA9 16792 bytes