Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ee59f77ec662d9a…

MALICIOUS

PDF

88.8 KB Created: 2021-07-01 16:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 379f2f6a3510a067af1217ebc2faf761 SHA-1: 6087da4b41a58c96aa1959dfcf7688932145f01c SHA-256: 3ee59f77ec662d9a1c0a976d535e2e5905b2de60b7ba9ce74c1c412b48b1bc2a
156 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs that form a link farm, directing users to various websites, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to exploit vulnerabilities or deliver further payloads.

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://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/cf911124aa0255266f00b2488ef289f8/43207525625.pdf
    • https://caribemed.com/userfiles/file/jubanujixuvaxoduponu.pdf
    • http://ekolojikweb.net/upld/userfiles/file/93702499615.pdf
    • https://topclassgreenery.nl/images/file/29471512441.pdf
    • http://asesorgubernamental.com/images/file/53990256621.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a89b6762e---58181266256.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1cf0125c6---dobafaxiboruguboxuxu.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/fcb6b984072509fa017306220d6d9019/93205733600.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/vugevsu1n1841mmvej95n7qbt1/50638131508.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/fsin0h6cjeoi4rune34lg0ubg6/87496432596.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3df06ab54b---guwis.pdf
    • http://brkvinc.com/userfiles/file/21935219498.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c530a570289---valimorix.pdf
    • http://accronline.com/userfiles/file/10826596444.pdf
    • http://fanti-fitness.pl/uploads/assets/file/93342990041.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/64639fea6bebc14253237b5774d0e1e7/retewiz.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/kvbee4o8kvaas719j3ovoh8h94/60422763140.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b3ab80cd463975f2ae5ec75e9d99f57d/muxujejafo.pdf
    • https://bnovum.hu/downloads/kixoxodekaxipijujatu.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b09ec1b808---surupemofekigazevaw.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/03c210f385a3e5adf92c0040d4cd34e0/39909960966.pdf
    • http://creative-format.com/upload/editor/files/54513952749.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3dfcd0fd3---51896635042.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/7abcf74b5417e26f9faf26172cbe7107/koteroxuragosilunoxezofiz.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/f50ada81985ca4b6d11feb4b711b7415/66106778820.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a64d47c44---37191411310.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=energy+and+environment+textbook+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_off0000f43f.bin
ea0e97b42c5f090f948018d88b75056cdede9c526eac425d28409839a21cf4d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF43F 11124 bytes
font_01_sfnt_off00010dc9.bin
694a5e16747084a5d65cceaff805b0ca64758a132c37d35955f374cc5bc99925
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC9 17572 bytes
font_02_sfnt_off00013bfc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFC 16792 bytes