Malicious PDF — malware analysis report

Static analysis result for SHA-256 46bcc4b4b5cdcf9d…

MALICIOUS

PDF

95.7 KB Created: 2021-07-07 19:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78e272ccbd37332bafc7baa0fda77392 SHA-1: 11eb6e46eeb7da434af08aadd6eec48d01263fd4 SHA-256: 46bcc4b4b5cdcf9d4ca975cbf97261cc8af7711503a225a36f4688f0fc69bc79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607831da78908---forasojerobopama.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/47aca41718e455b486a82d0564629bd0/909329141.pdf
    • http://ehomeforeclosure.org/images/file/93912902661.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993a1c4eed6---girepaxifis.pdf
    • http://malbreil.com/userfiles/file/jimilo.pdf
    • http://emmanuelmissionarybaptist.com/clients/74938/File/52841739056.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca9b048a5---wifasukixepigadobumafuki.pdf
    • http://sun-tes.ru/files/file/fepemanomuzolezotonodutin.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608472f9ef94f---18732880246.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/rplfmhmk7ac51m54kj6ifflji0/28154670137.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/66772899802.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/a2d6b8711508951f594f63d0b6a69ab2/vafotejid.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/9714d5c72680512399f19b2ab7dfa3fc/pozovozexinimuminafexonor.pdf
    • http://amghanoi.com/images/ckeditor/files/17368007784.pdf
    • http://huntland.hu/upload/file/dubavuzudifulilu.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/82321c47ae571293601b4b893f7b5c8e/64037789736.pdf
    • http://neoneophytou.com/ckfinder/userfiles/files/nurazisokizevewamabo.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/eb44e36f831ab475aa3866a97e979234/49861329670.pdf
    • http://splogservice.ru/content/file/52580731743.pdf
    • https://investmentskillsgroup.com/images/userfiles/file/30741357032.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1694df36a---57008101360.pdf
    • https://juhaszautovill.hu/userfiles/file/lujiwapabosijonufi.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb718ebb7e---bagifivevoxile.pdf
    • http://www.deopendeur.org/imgUser/file/96138028149.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d633f031799---wizevibusaxotukowef.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c34445f22ff---xulofotamunisu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=soil+texture+triangle+worksheet+answer+key
    • 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_off0000f3aa.bin
76fb35d2b80e066bb53dd0bc0fbb6b42eb9526bfb88891a2776b3be445f371f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 32528 bytes
font_01_sfnt_off00013f8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8B 16792 bytes
font_02_sfnt_off000157a2.bin
ed5029e799f2203ddb8bc7e45b96c341427fa76e9a606eb2ea23e076323871c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x157A2 10956 bytes