Malicious PDF — malware analysis report

Static analysis result for SHA-256 462a617c0b65ea7e…

MALICIOUS

PDF

84.9 KB Created: 2021-07-24 02:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c80f1eb60bb2f36f23269c65d6d4c54 SHA-1: fd469034eeb67c239fedef1e60817141e275b23f SHA-256: 462a617c0b65ea7e8ad3d7a2381f021d796008922cb14a01f70dbd0ce271b776
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to lead users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608780ee4c4fe---64335863180.pdf
    • https://pbchistoryonline.org/uploads/file/jitalubogeg.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f5b58d0d---rabazi.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd75e3575c---14418195326.pdf
    • http://artospace.com/pics/file/80410539706.pdf
    • http://szao-spb.ru/images/news/file/36821734687.pdf
    • https://fotojursa.cz/userfiles/file/pumijirevuzinelevoladum.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/894f64dcf61767cf41513b208098eaae/92204766671.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/a2qh18kijmmo7d1aurj3nk266s/40004644088.pdf
    • http://casier-a-bouteilles.com/file/10485080485.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/99716d7b3361e840c2d157e8e65caeca/74789009849.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/c5n1dadvoovh7je5mnd5kc9i92/70106391497.pdf
    • http://autobedrijvenindex.nl/images/uploads/57306144839.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076347368c9b---mumozexugigizigipinomekiv.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/95366559631.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/6103592e9e66df8df9f2ec6c891e6f4d/taxigon.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ceda16705---77593864436.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/q37a3ju8f8ilua4aao3qto5lf1/53089088312.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86c96a676c---bobulexilawotefum.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/3fc4c18a3bce4db97c6b51f3f03b8e4d/tusunesidojok.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/4hgf5u0c042kk8889bktuep7um/68622924587.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+does+find+my+device+on+google+work
    • 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_off0000e777.bin
fb52b3410816c280f7d1c56ee68b3cc720baf14414000c6a6970d73f92a17139
pdf-font-stream PDF embedded font (sfnt) at offset 0xE777 17084 bytes
font_01_sfnt_off000113f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113F9 16792 bytes
font_02_sfnt_off00012c10.bin
a1746bef16448fb6a331da57bb675b1c017d4a11128f86493c393b92a2f45d12
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C10 10908 bytes