Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfbe55f67ad8f690…

MALICIOUS

PDF

91.8 KB Created: 2021-06-27 18:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0b653f40cc5eceebed614d291d34099 SHA-1: ba1cd8e53a157121bff0e47ae463cc819d96503c SHA-256: dfbe55f67ad8f690294e5c490a067ab37895eaeee021ec9fb64c0d3230fea825
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm or redirection mechanism. The presence of external URIs and link farms indicates an attempt to direct users to potentially harmful content, likely for phishing or malware delivery.

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://medvor.ru/uplcv?utm_term=manny+pacquiao+sketch
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5de2a488c3---kazabapibadodakezixega.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c294d70a60---kexosiwexegavofebusib.pdf
    • http://china-miyaco.com/img/file/202152882430.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16c620be4b---kifowomileku.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/2mbedbql028f5s3ql83qa8r5hd/mofumavagadasinomened.pdf
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/9b2816ae0952099629b3bd22c7e9e862/mogijopofuzatetuwubufoge.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/614fcb9bb0230c0e174765b307725082/fedutoravatanagufumof.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/dpbccgec5c0d6rtjr6261mqb54/kilunonoritape.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/86ffbb749c5bf63ca1b8879e3972fcc1/puwipizewenider.pdf
    • http://alexhofford.com/temp/files/file/nawokitejifuxobanawebifen.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/godeogq4e347nn4mdudueavkop/larurudaxozodisirup.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607942a612c33---98004850747.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad99ea609cf---18305281576.pdf
    • http://technoculture.cz/admin/upload/file/85946516388.pdf
    • https://zhansq.cn/upload/file/tutuw.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ef7b3c4ae---91151617247.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/e6adfb684053de6a56930c94711bae81/sajazerilep.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/baad77b6de4a1b541a29ff4580d36757/julafilelufarugosimirij.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2efb1191f6334d2700f899da09b4d7e2/fizijav.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16085cdbe5ab1d---42314589690.pdf
    • http://peaceinsrilanka.lk/userfiles/file/92604095879.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c53de107a9---21476398405.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa68a16546---masajekogaginate.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/3670aa383cd4818ef30be27e653fc756/83958107889.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5aab6c3b3---nesugosigex.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_off000103bd.bin
5ae0acf3564f70da9e73e64f263057a89978b3899e6c031369f8901124f078a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103BD 17384 bytes
font_01_sfnt_off00013126.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13126 16792 bytes
font_02_sfnt_off0001493d.bin
9f130c04766cb2ff947c6a582cb988b08d7d23fe705074b1aee5ba89a5e64504		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1493D 10768 bytes

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