Malicious PDF — malware analysis report

Static analysis result for SHA-256 af94bccb951a3eb0…

MALICIOUS

PDF

99.9 KB Created: 2021-08-13 15:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6e470aaee215dbeda9704ef5cb8ea4b SHA-1: 6b5718bac89867753f9b0774397f2ac2115350b8 SHA-256: af94bccb951a3eb09008acf807cacd8c965ffabdda1f2a3096308c3db7640c5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious or phishing content through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://gaziogluenerji.com/images_upload/files/zokewif.pdf
    • https://clubelsendero.com/img_pag/file/durimatajarutodovafebi.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cce87322c8---62982419148.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085edb116860---82215974439.pdf
    • http://surtek.biz/image/files/20150120_083651.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/diu7h8cdm4gqc2bjmmfbsr6n67/sapidibowemubudodakuwaj.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/3da39a973db6969fbf828b5a590797ed/rezesufidifasez.pdf
    • http://deauville.ru/files/file/bisute.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/577ac42c9fe00eba9b86f5239fcef7b5/junovakokatu.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f57b84b77---60033603457.pdf
    • https://mytopics.it/uploads/file/ruwesi.pdf
    • http://classicalgardenornaments.com/uplds/file/31127816502.pdf
    • http://odontotecnicacoop.it/userfiles/file/14148799277.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/pt6b9q3ncq0tbusvte9ne9gq5n/lazafo.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160afa2cfa09d7---73897703998.pdf
    • https://by-express.com/upfiles/editor/files/97465114138.pdf
    • http://landonintergroup.com/ckfinder/userfiles/files/xitajukiromiwejaboberena.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a40d6b4b1f6---52888693461.pdf
    • http://alumcity.ru/userfiles/file/morore.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098afb7cbbbf---medijekafinorinageza.pdf
    • http://ecohost.ru/pics/images/file/7067693875.pdf
    • http://bigxra.com/uploadfile/file/2021061615080973499.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=reglage+position+cintre+velo+route
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 16792 bytes
font_01_sfnt_off00011e09.bin
643c3755c1f98afcbbe9fac76376965e4daf59a877b59f8419ffa7ab078f5627
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E09 10760 bytes
font_02_sfnt_off000136f6.bin
1ae053df745f5cb0b4f74187ce93f9792f36fbfa6f2785e499076d27cb908a88
pdf-font-stream PDF embedded font (sfnt) at offset 0x136F6 18832 bytes
font_03_sfnt_off0001655b.bin
d129ff5503f4efa56069f52d1c4b479d7f13d5d91b62786a8bfead6e85e8652e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1655B 17332 bytes