Malicious PDF — malware analysis report

Static analysis result for SHA-256 14682f0d1cc78591…

MALICIOUS

PDF

79.0 KB Created: 2021-06-25 15:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aae369aa7899305ca408eb4509ec46d1 SHA-1: cdf0b72dcb4367184330584bc80b7b9b0e90db00 SHA-256: 14682f0d1cc785917dac5513381ebb05eef0a0fd3d23a43b9992103aace61d39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URLs point to a common tactic of using compromised sites to host or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://archism.ru/uplcv?utm_term=adorable+girl+meaning
    • http://chickenwild.com/upload/contents/images/images/webuwita.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/g6bnt3q5e66510no2o0vrv4g84/68194325155.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/17797975342.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/4b399656f58a29b0a07b64c2e0095ab1/95427227090.pdf
    • http://adabaskimerkezi.com/upload/file/73746034190.pdf
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bf96a5483---maxuj.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079436d51dd9---gogemarefetukadujebo.pdf
    • http://bjsprt.com/uploadfile/file///2021061911130386.pdf
    • https://keongracun.org/contents//files/66268887378.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876fcb68b9d---40701757947.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f9a71ce54---jupilaxivalovuleziwenuxik.pdf
    • https://susta.vn/userfiles/file/zuvuzafekogidosesewefaku.pdf
    • http://georgefamilyreunion.org/clients/86186/File/91859689728.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/1edc7a76947cf75b8b8665ac0e4e5166/jojifo.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b83ce415325---migimurawusatapato.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_off0000c892.bin
00e80127792b466d3f2619a2103c55a735be4f38635689bb7bca9a1617a5e2d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC892 20336 bytes
font_01_sfnt_off0000fe3b.bin
c9b857b15203862a4dd9841a909fe09ca808f60fdf9a863dd5516cebc310e4a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3B 10448 bytes
font_02_sfnt_off00011599.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11599 16792 bytes

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