Malicious PDF — malware analysis report

Static analysis result for SHA-256 0747a1d4311d9442…

MALICIOUS

PDF

86.8 KB Created: 2021-09-03 23:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 40c475dcb2f72fa519151c8c82cce4f9 SHA-1: 26de6747c160afefb57fb3ec85db16abd3f1c6de SHA-256: 0747a1d4311d9442b61833289d0f91729d310c8afe5c92fa13fc8353fa8fe106
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF-specific heuristics related to URI and link farms supports the conclusion that this document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ciccioinpentola.com/userfiles/files/13033536501.pdf In PDF document text
    • http://bjsprt.com/uploadfile/file///2021052805272440.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/ejo14uhvba2j71qf97l7718l21/vawota.pdfIn PDF document text
    • https://t2sc.me/userfiles/95075598720.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00f7e1fbe9---58919557849.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3806e4191---17291915492.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160b405bc6676a---mebob.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/nurebogeki.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/69010665522.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee5521739---nivusetivenanemuwatu.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e16d4968fd3---puwetopuzutemixu.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ffb82d74c---98074342929.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/qvunsgg55bhji0on7nc4iu5298/24559687436.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/pilejavarixefix.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/nulanawogeravuluguravu.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd757845d8---70290062649.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/zajarapuxi.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1f4a1ee94---42974984299.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/89647983112.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cc676981c---26447310177.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/b68b07d83b6bb289fe958b8ab5f9a5e5/56202151113.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f67f230bd---guvarusifomunajolo.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/15216324236.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/6ed3e81292b3206c18312658854869dd/tajejakipitu.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/bixikarasoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=godfather+part+2+script+pdfPDF 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_off0000ed5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5C 18008 bytes
SHA-256: 531349bd8d5a59db533aaa6a9d94c22e02abb3720c6461349c6e34f64ae1b90c
font_01_sfnt_off00011c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13498 10728 bytes
SHA-256: 7ba9525aca55941ad579fd02df9bb68fcf6a3ff09d9561de42c08b81a0aa435c

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