Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01afe644f81160d…

MALICIOUS

PDF

74.4 KB Created: 2021-06-30 05:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b77e260abdfb4e01d7350de8357a293 SHA-1: 96645690c5c111f63e271e78f9b2c07e0836f089 SHA-256: f01afe644f81160d8889e5404ff19a531adbc79ecc48fff9bf1977ca2a3656e7
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The heuristics reveal that the PDF acts as a link farm, directing users to numerous compromised WordPress upload storage locations and disposable hosting sites. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://krisoc.ru/uplcv?utm_term=calculate+the+earth+fault+loop+impedance+of+the+elcb+tripping+current+is+30ma
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733bda75c7f---rowunobopizizodigur.pdf
    • http://apvn.info/userfiles/file/48798463211.pdf
    • http://fonnepal.org/userfiles/file/fisigimigezepuliguxetunob.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160db8e9e536a8---lokar.pdf
    • http://meta-min.com/files/viboranabe.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/5d3ff0e64f8a095c25e79ce5d11acf59/89966490091.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cee72521acb---41303103859.pdf
    • http://azizolace.cz/images/file/tekozogux.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607614f22862f---43672860043.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ae32deccd51b465fedb425f496c6b2b6/8814321680.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c3782790155---34916372998.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c91a11b15b---gosunidifisobigu.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6623655be2---verexujagejiwifiwum.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/2b34077d26ca8e1dda9aab04f54f135a/64208212748.pdf
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/tejanixugaledi.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f793f97233d6fa452dbfab3cdd947c1c/55729568120.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/84933aaadc823fce77bca45fa7dedeca/setekimamopusixubesegijus.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/130e8ca2240dd3d03f8dd1b590a296d0/17506081923.pdf
    • http://barudan.hk/UploadFile/file/20210621063408169.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e92aa0d27---gisevavuripesof.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a095fab52fb---vokubagewanijetonu.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/0fa6d62b6787f67fe2d7cf03c6e53ee3/36077221689.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b453ecc9570---tijotajefo.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608825bdbbb64---tiralofupabagefivo.pdf
    • https://muacash.com/webroot/img/files/76839179466.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/d7b816b9069aab311481ca6f6ea4ff0d/14033120502.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_off0000bfa4.bin
6d011bca322f648b6de40b048149b918c1ae4811a3b1a3af8763e07cb80d4cd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA4 15868 bytes
font_01_sfnt_off0000e810.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE810 16792 bytes
font_02_sfnt_off00010027.bin
78e87e353ddf7b0048c8dc2f4a09f5840d818df265c2a7714f1159bbcebccaec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 11632 bytes

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