Malicious PDF — malware analysis report

Static analysis result for SHA-256 94286cf41f6f8663…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 22:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 747ca4f4daba8917d66da11c52ec3b63 SHA-1: 58d4c3780d6ec8bef489157ea98f94c62dbbb388 SHA-256: 94286cf41f6f866324607779e125234f41252cd867614c5bc33be7f23137215b
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 other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and compromised CMS upload links points to a sophisticated redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=libreoffice+instruction+manual
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609834f81a72a---80920803212.pdf
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/waketoga.pdf
    • https://ibliberia.com/ckfinder/userfiles/files/rinajunabi.pdf
    • http://le-bouquet.be/userfiles/files/18308869540.pdf
    • https://laps.pl/userfiles/file/famunu.pdf
    • http://clinivetmadonnadirosa.eu/userfiles/files/kubakawetinigofobi.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160af94ef387fc---davosefolupuma.pdf
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/moturegalolu.pdf
    • http://aotwresort.info/ckfinder/userfiles/files/78055432774.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ui4dj1vblmjfrjvnhto6t3t4a6/99095990760.pdf
    • http://saovietgroup.com/upload/FCK/file/rutewabafijogawafusiwuvuw.pdf
    • http://bjaimama.com/data/upload/2021/07/file/202107052335302015.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/21efd3da3330f9e047c68cdf260ae768/20869030384.pdf
    • http://tuzvedo.hu/elemek/file/87739890954.pdf
    • http://zabradli-znerezu.cz/userfiles/file/zevidijegipetavupibo.pdf
    • https://erdenetpost.mn/userfiles/files/miterokokif.pdf
    • http://goodmix-psc.com/userfiles/files/2759666116.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2e0edc39e---fikadakule.pdf
    • http://thanuyentea.com/ckfinder/userfiles/files/37116898623.pdf
    • http://mayingiabao.com/upload/files/7600413450.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/6f8db9fc2d45b5f164799426c0990a1d/38366611565.pdf
    • https://micro-logic.ro/images/uploaded/file/mumumawaxim.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_off0000ddb4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB4 16792 bytes
font_01_sfnt_off0000f5c6.bin
af6eb21180aea36690345baf854f04aa225613f6c8cc2bb347443700164fe557		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C6 18120 bytes
font_02_sfnt_off00012485.bin
a51f368a4f2c99acd7af597177252d969ba647bfa272e6b09c220cd0dc06a9e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12485 10692 bytes

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