Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6a75724d7ebec1…

MALICIOUS

PDF

82.4 KB Created: 2021-07-01 21:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59f5678b7fa418cc3a64c6ad610c90b1 SHA-1: 43d8c371caae86bbceaf54d83206f7cc948a7f3f SHA-256: 4c6a75724d7ebec1e7374c3c3f1bd3c73f9a99e0b311b61376ed5a1b30c32bdf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, indicating a likely phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, with the link farm heuristic further supporting a phishing or malicious content delivery pattern. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609493260dcd9---tozewofozusi.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf28623fd44---farabomiraru.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607032deee3fe---84891350401.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d04ec27b18---45619610259.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6a1c93773---jilasuguxo.pdf
    • http://innovatepc.com/userfiles/file/52289966242.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ff9098746---lopijizel.pdf
    • http://championshipsportsrings.com/clients/23492/File/22216387953.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c849c8fe29---18500615590.pdf
    • https://andrejc.si/files/file/46529489516.pdf
    • http://www.hangmandigital.com/files/file/70330863948.pdf
    • https://khanikango.in/file/sumulutatajiwixorebiz.pdf
    • https://hzautomatisering.nl/userfiles/file/7698860246.pdf
    • http://scuderia512.com/js/upload/files/xagifolufuvutirukixur.pdf
    • https://fishboat.hr/files/lumofujajiti.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/6a4a2c164dd93d2ede1b36de039fcada/17589750712.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16081acd5c1268---kubukijusakakigug.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d56838ed44---vulosur.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f434aee5e1---sujol.pdf
    • http://davidhammerstein.org/ckfinder/userfiles/files/ximis.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608685c4a9191---21419569455.pdf
    • http://architettoseneca.com/userfiles/files/tadotalopapakugigogesebo.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/74988866878.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf136b774ba---45006648803.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=immersion+heater+no+hot+water
    • 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_off0000df46.bin
3eb290cc3b99ae1d0aad9a594109a8b580e8126d94b5ef0c59c3037e1c81ea50
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 17572 bytes
font_01_sfnt_off00010d29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D29 16792 bytes
font_02_sfnt_off00012540.bin
949512b60691a1348db62c190aee909667a5c900a84c211906b6e470e858fb61
pdf-font-stream PDF embedded font (sfnt) at offset 0x12540 10364 bytes