Malicious PDF — malware analysis report

Static analysis result for SHA-256 3813408004539d0d…

MALICIOUS

PDF

87.3 KB Created: 2021-07-26 18:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 813ecc00d6785e5d085e42e5ec49c118 SHA-1: eb640037b1eb7cacbfcefe0ca5e81c28276d5cd0 SHA-256: 3813408004539d0d681b2503707e19063e432cf8cab872610844f359ec5f11b2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ClamAV detection and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress installations. This suggests an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://prolocolidodisavio.org/ckfinder/userfiles/files/12102800534.pdf In PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/fulimaverozijudadizi.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/15925952890.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/73918639528.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a50e1d6c246---zoselukasesebagol.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/94468535697.pdfIn PDF document text
    • https://mavibusiness.it/file/15939113220.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/d540d470cbc6967a2027331dcf046515/padakurifatupobobodemid.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/93226669120.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160722abe38297---bemitovipivibasekafewu.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/54911249336.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/rinomovixuzog.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/2752a147870faaee39d2cdb375e224f1/87679111226.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cd1252bc2e8---konexamofogunaj.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072428d72733---zizovidupitidesamufa.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/pixebomomelatirixelijif.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/2035777628.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/04a4fc1ad1b3316436a329e2ff6bc257/luxigufabisir.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/97495874931.pdfIn PDF document text
    • http://acril.ru/ufiles/files/gexipetujilez.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951bf225bff---49001969801.pdfIn PDF document text
    • http://rayanchem.com/d/files/zuxorowagedapisipi.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/54acfab16b345e5666a441681067f468/29549579210.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/q8gbe4487gfcbantfjov64pua0/wexunisaxasupikixonivito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=forza+motorsport+2+xbox+360+car+listPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B3 11160 bytes
SHA-256: 65b7b38f08b6a6dcd0e87657ca50e2969cb21c0a242c7a6b02678ed769beb480
font_02_sfnt_off000121af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AF 17584 bytes
SHA-256: 99db1f04d0ffd03c921d06f4cda42ef9b5c9191056e467674e8e559bbbf9790c