Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f3debf6cf50849…

MALICIOUS

PDF

87.2 KB Created: 2021-09-04 13:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 809adc3ecd04019da925f25688575cac SHA-1: 2980708d8e040265dd4ef4d6516291a926f5993f SHA-256: 85f3debf6cf50849e69d2069ed9eff7b132c02d9e213dcbcf3064d3ac0ffec3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to compromised CMS uploads. The PDF contains numerous embedded URLs, many of which lead to potentially compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://grgct.com/ckfinder/userfiles/files/79555000618.pdf In PDF document text
    • http://andrelandberg.com/userfiles/file/kobagogujodeguripovebe.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/eccbaca589a55a0db41afc090db4ade3/83925136413.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/23731105982.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/75255232592.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ea2f34f63---famumamiparurenosizixeko.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb7c0e81e8---49302878148.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/95138157376.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608671ee62945---29658918343.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/14043198458.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4fecdf055---jidekos.pdfIn PDF document text
    • http://flexa.cz/docs/file/38104702759.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/97997985351.pdfIn PDF document text
    • https://atl-50.com/files/file/moxamuwategoto.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/69940363389.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/6686328366.pdfIn PDF document text
    • https://tipresentoio.it/images/file/kavigeketuxivujovavakevid.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1610f97dd47c15---14037708501.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/wavur.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/rinado.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737c96e76e3---wizawomuwireguxadozafova.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7926d7f3bc---12534280784.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d778165a3f---roneweselo.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/0d486f34d09c2f8d6e206d62e7b4526b/27458628447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=shin+kanzen+master+n4+grammar+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE518 21480 bytes
SHA-256: 94faca89c8bab41060e8559021b199ba875a03c0502f9bb0f72601859fb3f1aa
font_01_sfnt_off00011de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE0 11084 bytes
SHA-256: 2dc2e60b73c922771877934a56148fbe69bc80251940dec1e9375b2abb6c64a7
font_02_sfnt_off00013761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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