Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ad939f677fd427…

MALICIOUS

PDF

72.6 KB Created: 2021-06-27 13:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6488e4146b28752bac6b520dcd9620a0 SHA-1: 40c6bce51c3e8ec3e3547e8d47846ec671a396b6 SHA-256: 03ad939f677fd427652a04fe3effcf6bfcd592268d72661aa069bd48820c4e1d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload storage and disposable hosting, likely to distribute further malicious content or phish users. The document body is heavily obfuscated and contains no readable text, but the heuristic firings strongly suggest malicious intent through its extensive use of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://ourhkg.com/UPFILE/userfiles/files/pobab.pdf
    • http://awkontrakt.pl/ckfinder/userfiles/files/6874765089.pdf
    • http://soflocops.net/clients/81266/File/82271981991.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37946ad58---95711738597.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/49b4b5c0a583c3174f0c460ef48d7164/80697035302.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076653d4eb74---fisogakuninawana.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa5c13191c---remekoz.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3ad54970b---feledefoxizawazujur.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/18e4aa32ecc68f79d73d108ff5d567af/jamasaxig.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/r6q2gc4h2cqlslc88hjd9h52c1/gesifapizupev.pdf
    • https://airflow-skateboards.com/upload/file/17836389195.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/bccca257a0d897655759c20856c0adc9/71170109568.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f38dc521d---numefuke.pdf
    • http://kyanite.tv/userfiles/file/75953327955.pdf
    • http://gdgom.com/upload/file/210611075145696838k3fxrn2dtr3r.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966c099bb19---15631667874.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b125f2672b---39931638221.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160797286f3b0f---bozolowisuroxegux.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/94h71taet7k08rspr2rrlkisdg/wuluxemiloguzelumope.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1edb3df4d---88988652414.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607158906689d---pezanoderagab.pdf
    • https://anup.bo/images/files/xopoxa.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a3d66dcff---88317154517.pdf
    • http://ttworld.hu/uploads/content_files/files/92008849815.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9dcfce22a---nujojeserajadok.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=5+basic+components+of+culture
    • 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_off0000bb41.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB41 16792 bytes
font_01_sfnt_off0000d353.bin
151c1e1a288e656501cde564f5ca904fd83424199c8190372139ef66caa9fc55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD353 15420 bytes
font_02_sfnt_off0000fa91.bin
2fe8c327f75353d65d6866cd67d717c51c0adb2aaaa05c2c62cea5aa127c69bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA91 10920 bytes

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