Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f41b5da35f18625…

MALICIOUS

PDF

97.4 KB Created: 2021-06-30 02:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 144f5763b28d8d5da22490284ca9bd46 SHA-1: 5b1cf627b99f420a2e16cc37b3fd67be57f9ffb8 SHA-256: 4f41b5da35f18625eec4cf79df626e1bde039a7a4a2531a8c2f7113863d311b4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or lead users to phishing sites. The presence of these links and the compromised hosting infrastructure are key indicators of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/955a60cd762b2c5751f051ccd0119ad9/31939519248.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/orkavf32if84o6ed611q877el7/revedajodazoditoguno.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a179d5a84e3---33880218654.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160909b07c30ce---pevanitimakalagad.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5316f30740---ruzoroj.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b122e647431---tumokatiwalinoku.pdf
    • https://adasms.fr/userfiles/file/43146540544.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160944867f3136---gepite.pdf
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/72325527458.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/90hd3hq2utomhj3ubfuu5hlnt0/32421892790.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/79b83d983d8f19fabb4d8f7eecc0735f/767578991.pdf
    • https://aimara-bg.com/userfiles/file/risexabezeruwugolo.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b161375b85b---51086976852.pdf
    • http://andrelandberg.com/userfiles/file/27973552447.pdf
    • http://botosani.ro/img/uploads/file/vikixesiziwanavuwuwedi.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/3r57afretl1nouuc9sk130q2ce/5360525763.pdf
    • http://prestopc.it/upload/file/rafamewelukobebiri.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c41cfdea7bc---rajawirujesifuwoti.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083f91473626---56876490452.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/vhhqudu5fpvjpvdtfjcmgko3oi/31244220684.pdf
    • http://musorcentrum.hu/files/article/file/3275598662.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9bba151fd---rurarivuwezep.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba34c22458a---pipobetiduderulemegipudog.pdf
    • http://3e-recycling.ru/app/webroot/filesfiles/gexunezowidilovikubi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pericyclic+reactions+questions+and+answers+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_off000118b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118B2 16792 bytes
font_01_sfnt_off000130c4.bin
cdbf366a8530415d746c9069b6c9c9089c51584068d5b6987522b370239e085f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130C4 17332 bytes
font_02_sfnt_off00015e62.bin
3ef4eea5273137d5e51722ed8d348d6628200a68450fb6848627ab7c2c5ea86b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E62 11060 bytes

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