Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6da062a5e9c38db…

MALICIOUS

PDF

71.1 KB Created: 2021-09-20 22:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46356671b1b70ae97fae43fdfd478f64 SHA-1: a10f696adaf74b645fd81cdb9e6c70545c8e3fe4 SHA-256: c6da062a5e9c38dbc43f425803a64aa2e14d468a10b8aee86845783ee5f5af09
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://catamma.ru/uplcv?utm_term=naruto+shippuden+ep+245
    • https://ventsistem-bg.com/userfiles/file/40059140425.pdf
    • http://gpp300.fr/userfiles/file/fesubuvaba.pdf
    • http://kurier48.pl/files/userfiles/file/81986709952.pdf
    • http://blueyee.com/upload/file/061152487851.pdf
    • https://pezenasenchantee.fr/userfiles/file/53228737851.pdf
    • https://securitydm.com/slicice/file/1124836069.pdf
    • http://cosmoscm.com/contents/files/19175171374.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b401139b5---wosulusidoz.pdf
    • https://dodomacnosti.net/data/file/97590243855.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304f2a88920---68841524270.pdf
    • https://aymexco.eu/ckfinder/userfiles/files/41965785821.pdf
    • http://zjleiou.com/images/upload/File/3464231392.pdf
    • https://irantruck.ir/data/file/21513591990.pdf
    • http://assotechne.eu/userfiles/files/pukovapakeg.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc3c3d3429---rukenibazegugisezafasado.pdf
    • http://huichem.com/ckfinder/userfiles/files/ruvubejuz.pdf
    • https://equinox-e.com/upload/files/sujirejodeluk.pdf
    • http://yh-nutri.com/filespath/files/20210907202436.pdf
    • http://studiotecnicodambra.eu/userfiles/files/vivopisa.pdf
    • http://ylpqzl.com/ckfinder/userfiles/files/tarivasejalepojagexeri.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147edd92c389---gerasisolodezuj.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/72268029796.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_off0000af02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF02 16792 bytes
font_01_sfnt_off0000c719.bin
46fae139ae47f5acb15a30fb6a799638deba90299de8245db686de33b9185191		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC719 10852 bytes
font_02_sfnt_off0000e03e.bin
a1735ef9fc9566d6258e000a94715658c9cd90d9649561809d04542bf1d920a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE03E 17448 bytes

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