Malicious PDF — malware analysis report

Static analysis result for SHA-256 769f68269485f603…

MALICIOUS

PDF

92.6 KB Created: 2021-06-25 14:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7f9b8d9b096407e439aa548428bf626 SHA-1: c35ebfdea276473ea60fcaf53102cc306a738e94 SHA-256: 769f68269485f603ac6381213a3b24b0c28e6bdf108a332a6e0a3a2c2af3db68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely serving as a lure to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://archism.ru/uplcv?utm_term=larimer+county+justice+center
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/dd19eee285fac2323561eb83d6a84dee/mezesedefumuwofene.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607943c103ce5---boromexezub.pdf
    • https://foundryindia.org/userfiles/file/lozosorajaredage.pdf
    • https://trunglamdecor.com/uploads/userfiles/file/buvuramirukapibolenireta.pdf
    • http://mnogonomerov.ru/uploads/file/13968524997.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609293ded7569---18195522290.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fc04b1d1b---66853043044.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/2554603860.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/f3ddc7104ed86ca4c4cde64b6d4a495f/95476596156.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/86d2038d082b52db8b722577f6099c6a/53161390812.pdf
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/xudajumen.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3d3d7770c---kumalasobumudebipi.pdf
    • http://28777886.com/Lpf/UPFILE/userfiles/files/xirim.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5090dd2ac20c0a7485ec57d420417460/19693201178.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/53644239e993478498a17cb002a43878/fobowemovurulaje.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_off0001048d.bin
68cd42fd72c90dffd2246ffa2c25d83fa397dafaa23c59e7b8ca89e47eb165a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1048D 17792 bytes
font_01_sfnt_off000133ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133AC 16792 bytes
font_02_sfnt_off00014bc3.bin
e17ae3477aae2c0252f8dd19f6289118ad01a97f1f3bb3ffcbdce250572f5482		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC3 10648 bytes

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