Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f25656cd738072d…

MALICIOUS

PDF

85.7 KB Created: 2021-06-26 17:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd2eb4b49dc66a24c58646205403d774 SHA-1: 2f9e3bf61de9580b12345a6f64c0518f0ee39392 SHA-256: 2f25656cd738072d3137247425cab02abf2a8558972225af0d2413d435e309bb
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple compromised WordPress sites, likely to host further malicious documents. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of external URIs and link farms suggests an attempt to lure users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/ciq9dhgkqv9j4h6o1af8r6s22s/doruregaz.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6561fcf57d---rapoxudupe.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e606a3c16f---tokusigamejipokodaf.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/botorukutiwed.pdf
    • https://rijst.nu/userfiles/file/51247154983.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/124239f1292306bf7d9ddcb3a0824e37/94078340392.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756e5d8f10e---64725645684.pdf
    • https://suativisamsungtaihanoi.net/upload/files/29926235997.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/71330f15dc5034928b12b224ecad50cf/18835052624.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31b7967962---1591578809.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/519198c73f84bcff04853fee3ccbbca0/fovuziwovaboveb.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae555d98dd4---zimofurik.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b896a6815bb---80480352283.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c96da2705b6---goloduwiwigagezuzokun.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/dv56i30mdseqnd34nmbsfh9tq2/gezitoxijunibezigak.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608470edeb9a9---vefimedanivaf.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6ecba56b7---29077305708.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdeaafb62d9---wurelozimavesewexijaxonof.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff58a82477---kudolisizovijutiwef.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/1da23e12d70f3843252fe6e9ed144a90/fefigajufomina.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160792b9906def---lutef.pdf
    • https://an-professional.ru/img/files/file/28228819628.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=mcqs+in+prosthodontics+and+dental+materials+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_off0000ebca.bin
e9db98589fef251a38b07a0c4e764c068ad6b5b036c2dc71bb60d83c6a152592		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 11024 bytes
font_01_sfnt_off000104f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104F8 16792 bytes
font_02_sfnt_off00011d0a.bin
60ebb9d4f966ba913a36bd1df1f8eaed4d4f42892aaa44c75a2261e4f9ef4aea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0A 16972 bytes

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