Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3bad3a5e27c7a04…

MALICIOUS

PDF

88.3 KB Created: 2021-07-15 13:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6fdbabaa1b8d7a8271fec70678064041 SHA-1: e9b7163418c621c427a0e83b8d9101d34cc1d305 SHA-256: c3bad3a5e27c7a04255f4b01829f33ed19ba037beace6e61507e88f9d22eb22b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress sites, and ClamAV detected it as a phishing trojan. The embedded URLs suggest a phishing or malicious content delivery attempt, likely using a spearphishing attachment vector. No scripts were extracted, but the structure indicates a malicious PDF designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://wastran.ru/uplcv?utm_term=protein+and+calorie+malnutrition
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b5178d3ca---kiwokajipilarazepadavu.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f55ae70c03---93019570371.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608920e43b1fd---38105406469.pdf
    • http://com123.vn/uploads/file/95831716133.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609838bb14bc8---69847428879.pdf
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/fogasijapijusipanotu.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b844f6877f0---jekifonul.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbe9cb6746---sofuxewituwivegubunazov.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da1c18c6128---67975059558.pdf
    • https://nguyenhungstone.com/uploads/image/files/mikimofurifidako.pdf
    • https://ebdaatcoop.com/userfiles/files/kuvomufafekapurigivi.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b60c9430bcf---watuw.pdf
    • http://jevades.com/aircraft/fckimages/file/1234577938.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83870df89---70181731694.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608669bb356ce---gizifukan.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8fac97d9b762b2d494afb6f49ee4b18d/4535288734.pdf
    • http://shqinze.net/admin/upimg/file///povigudolanut.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a71c12a443---30662613015.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/acc969a9351e7041ba8550c967c53774/79239452716.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b810639f4---judikosujozuvazamusakan.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b65cea11d---dozebet.pdf
    • http://novichiha.ru/pic/file/69696744875.pdf
    • http://dsraxys.com/uploads/kowisikerufafej.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098642553a3c---88516970385.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a30459ba45---wasalonuranofevo.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_off0000f9c7.bin
aec9aa35c9d727e15f2451f55179482b6d6d787590d916929d56ae46fad2aeef
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C7 16496 bytes
font_01_sfnt_off00012458.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12458 16792 bytes
font_02_sfnt_off00013c6f.bin
22d85587b090044ff2b50af27ea573bf5edbaa870ef1a12fcafb1969abc8ef70
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6F 10464 bytes