Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd8b3c4c5d4f871…

MALICIOUS

PDF

73.2 KB Created: 2021-07-01 21:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01ece9d855d15421ff06a7b2855f6857 SHA-1: ab08e863ede9e81de8d6e4852316084636360252 SHA-256: 9bd8b3c4c5d4f87114f2621199887d5cb30f5736e3c70dcb9b3070ec15e35c56
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160975d9a82b6f---33661503134.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ot4mee164ss1ulp441vfcu99k4/31505018438.pdf
    • http://alimentosldm.com/userfiles/file/42236834014.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0d60127ed---14119389063.pdf
    • http://longthinhphat.net/uploads/files/49254240976.pdf
    • https://andhimazhai.com/images/files/73190468412.pdf
    • http://riggi.ru/userfiles/file/zewewujevojafirusukuvar.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/f036311ce039ead39649bcc6952e8019/baropejomokonufifiwijiwik.pdf
    • http://hayatteknoloji.com/webimage/file/6381177193.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8cc8fc01d3---12183875502.pdf
    • http://ahcxdq.com/uploads/file/171558438846.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5f7e16270---pawajewajukomudugesud.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786b437a906---86997920014.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/860ddfb1fab4390a0762017f847a1dee/31870362239.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703567bf270---19920273596.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/76da787f1873bc53a4bdb658a9bbd4f6/48211519145.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608566d49e399---rogirewazopuzemupokir.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16099d64bf0f73---tegapefilin.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ub0g3fd3lqabokus0urbg04sp1/wamawikosezimut.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d099235e3b---gupukerebox.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=stages+of+production+in+economics+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_off0000be8c.bin
f19c8d0f4617166bb2b48335bb5524bbb7545ed92629f29acb312bf8f16ebbf4
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8C 11092 bytes
font_01_sfnt_off0000d82c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD82C 16792 bytes
font_02_sfnt_off0000f03e.bin
1abc5a812c1f64bd5e0881591bba0da4735970b9101c86177d3ff2d7625fb693
pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 15492 bytes