Malicious PDF — malware analysis report

Static analysis result for SHA-256 36aa63878bdad8e0…

MALICIOUS

PDF

90.7 KB Created: 2021-09-19 04:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b6860f4006cfda20c535733e728cfac6 SHA-1: dbd803b88b5b978a73ffb5087cd789ad55b71d41 SHA-256: 36aa63878bdad8e0c44ca02f40d45c929e3e0f06dd15e44adff50165f662931b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of numerous links suggests a link farm designed to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://monographie.com/ckfinder/userfiles/files/vezejol.pdf In PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/fitiloxinukel.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/4418479267d84afcfadf7989656fd35e/27497132825.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/gapizadanegagowivageluwe.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/53606100145.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/81836379164.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/65022756493.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/namikadonaja.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e62eb2ca3e---suvopubevurebapikamige.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161373b007d235---nekiditidedirekazaza.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/bijupadibarolexutibuva.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/37246403875.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/56001524844.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/36501785376.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613549b19d6b9---bopiwa.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/95567224943.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/sugizapib.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/5824124568.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/47588313592.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109130130412111.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316ada7b9e9---27125671264.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f72396dd61---71831681752.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614117c6c52c2---21036144718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=funny+chess+gifPDF 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_off0000febd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBD 18380 bytes
SHA-256: 9bd7deacfc3b07aed2f9c03412655a55c492870344b100da86e73470f4355c64
font_01_sfnt_off00012e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E17 10280 bytes
SHA-256: e4bc090b3bacfa9204685e365482312707287584a1b9e44cd79da7e452cc3542
font_02_sfnt_off0001452f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1452F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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