Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9c8679d0fc66b3…

MALICIOUS

PDF

83.3 KB Created: 2021-08-13 11:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bbfc96e20a055a55dd9b4c3e8232745 SHA-1: 7d764b27c6f33ec3a3da59d1893e5c047c3a0b4b SHA-256: 0f9c8679d0fc66b30ae0b7160eb01f2f680384c768c8cef2a249d07abce47a0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the overall structure suggest it is designed to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://drafthe.ru/uplcv?utm_term=tintin+comics+pdf+download
    • https://binarbaid.com/public_html/userfiles/file/loberetevoj.pdf
    • http://megalabsrl.it/userfiles/files/49072301582.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cee1ea599f---kotedexuliban.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/30l4urndiljdvpgr3u2ml9f6h1/40001250969.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978ba19525e---25794283755.pdf
    • https://intrigantka.ru/images/userfiles/file/80481766349.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a33f4bc5efa---9433978717.pdf
    • http://firegallery.ru/img/upload/38050813909.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/33f3198718856aefb82bcf7322b77beb/mosorele.pdf
    • http://yocarbroker.com/upload/ckfinder/files/morujeveg.pdf
    • http://prosquash.by/data/38963666943.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16072ec2352384---tebaliko.pdf
    • https://afayl.com/userfiles/file/fupejitoziva.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/5a419242c5c051a450c4f6aeb88c570c/64223195801.pdf
    • https://b2cexpressdemo.com/userfiles/file/kavogekapusam.pdf
    • https://tiemhoahaibara.com/data/dulieu/files/44747921828.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/vjcbl1672jj6uf2ge19oqi1iqq/76588452558.pdf
    • http://bulk-supplies.com/userfiles/file/lojewazotojesuj.pdf
    • https://ewt.cz/res/file/32046409531.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a5aecf9b3---girolaladoko.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5c57704ba---kejonenobanerotiteliwifin.pdf
    • http://vivaibonomo.it/userfiles/files/zujomimivekejedapexuvi.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_off0000e1b6.bin
a3ae3d3c4038f0b008e773a81d4f9161d3bc4fbf441f3a7efdafeed2e04e0f1a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B6 10600 bytes
font_01_sfnt_off0000f9fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 16792 bytes
font_02_sfnt_off0001120e.bin
67e931e85dc2d17599a156eb29b9b11cc0df6bb0e7676178c3aaa5f1cf181b32
pdf-font-stream PDF embedded font (sfnt) at offset 0x1120E 17004 bytes