Malicious PDF — malware analysis report

Static analysis result for SHA-256 b922ad8b234d5e37…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 16:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cacf37d91ab2083929ba134fc22b7a9e SHA-1: e8e6e81ea26c0c6b647a9646cc1e9af942cdcc44 SHA-256: b922ad8b234d5e37d2ce178d18c8d490244e3bcd86d31a612356b742cdaabc8e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many external URIs pointing to potentially compromised CMS upload storage and disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=online+android+app+runner
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/2523960c91f517de7c9defc7ca4ba938/maxusazejukudid.pdf
    • http://thuocnam.xyz/images/files/pejesukopuzitowawasozup.pdf
    • http://fanti-fitness.pl/uploads/assets/file/95327580877.pdf
    • http://cuacuonnhaxuongbinhduong.com/upload/files/48463405074.pdf
    • http://ciccioinpentola.com/userfiles/files/tiditewim.pdf
    • http://dakdekkersindex.nl/images/uploads/890550656.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc6cf9f49f---82796087898.pdf
    • http://bezagsecurity.cz/userfiles/masuwifonaluluxo.pdf
    • https://himalmanpower.com/ckfinder/userfiles/files/gawininiwabenorifarimava.pdf
    • http://vodova51-53.cz/files/zepaxojuzisexijowepuropa.pdf
    • http://yejida.com/userfiles/file/kemuxiguvizumi.pdf
    • http://budapesticukraszdak.hu/userfiles/files/duxewixipazikolomuvaba.pdf
    • http://cozycornerexpress.com/uploads/files/medosuporak.pdf
    • http://poetische-malerei.de/web/editor/files/dekiwunogabobemeza.pdf
    • http://dalboncostruzioni.it/userfiles/files/23888327786.pdf
    • http://gtlitalia.com/userfiles/files/93484200522.pdf
    • http://newgoodluckcrane.com/admin/uploadfiles/file/tigewufozoxujuzetesaduxun.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/87f50ed4c96652af082e00abb91fb5d7/67780501951.pdf
    • http://duonglaohanoi.com/userfiles/file/vinifo.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350a7887a18---fuwumegebarobujekid.pdf
    • http://cristal-in.fr/userfiles/file/xibomomelarapoxedazexage.pdf
    • http://jdjcnc.com/upfolder/e/files/20210905203654.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_off0000df41.bin
8ead8f35040c62f97b2d0155e6c513aebb612441f319ef5b1ea1e145937b72aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF41 10244 bytes
font_01_sfnt_off0000f645.bin
5ed434723d78f7307d1d6e553d0bcf82fdbd5b052c48186387d11c9f739e60c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 17316 bytes
font_02_sfnt_off00012328.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12328 16792 bytes

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