Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b45a2f5d9d87f2c…

MALICIOUS

PDF

102.5 KB Created: 2021-06-13 07:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7c169217ad24716974129d4215904b3d SHA-1: 3c49ce747ec83f1a19331bc1f556e87dbe068e69 SHA-256: 9b45a2f5d9d87f2c01956c310c2cb7a338d3afc9f471d922249e7136f54fd536
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://chcial.ru/uplcv?utm_term=digimon+world+ds+digivolution+chart PDF link annotation
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/648f6a4c9ec44d571a97eb6fa01c1ff8/wogajatugaxidavavatebi.pdfIn PDF document text
    • http://m2m2design.com/userfiles/812456741.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/favezaxagezejobusarazi.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8dc7ea5e7---5359748033.pdfIn PDF document text
    • https://vestol.bg/files/file/vitujiru.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c26bc4c758---45681677708.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c173623ba43---15503615780.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160854c877c47f---27977441658.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099155a4dd53---fetutivajotijibapuxidisip.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/todepedufem.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/89340634553.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0afb63aa3---46367562376.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/4dee4f46afbceec2229f304939f0a6c9/71346405617.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/02634abb31d2664e5ff1e60439bb77a7/sefofisimuxigofatagaku.pdfIn PDF document text
    • https://brod-plovdiv.com/images/tewaz.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160788751f0c2f---1798582202.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001252b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252B 6584 bytes
SHA-256: 81bec48603a3a0ea1dc9427acb089fe5eed6c74a2f0992b356c63534e0f4bf08
font_01_sfnt_off00013be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE5 5504 bytes
SHA-256: 46b8983490ede2b382fb45c42351490c053e9098caa44c32a910fcf5401aaffe
font_02_sfnt_off00014e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8A 9016 bytes
SHA-256: 2e8e31748159043fb79c6dcc4200a251d1344c316b20db68c8671584467af34e
font_03_sfnt_off000160bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160BF 13924 bytes
SHA-256: 8309bb3aadb925d4a602009898b61662c59ea107ef0b8bedb9b2c306dddd8d43