Malicious PDF — malware analysis report

Static analysis result for SHA-256 4177f6c289743e66…

MALICIOUS

PDF

173.8 KB Created: 2021-08-16 18:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d7182160b16aba41870ece617a5fafc SHA-1: 6e6d2c443b8e340273028db1b2ec739d85929da9 SHA-256: 4177f6c289743e6606192f0cb427e0cb807d6d0906ec5355beb5818c777fdc2b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and other disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/q9dhgmmiktf4847fgvuo9mcae7/sibukixodewitusem.pdf In PDF document text
    • https://justbuymeds.net/userfiles/file/vopidogegizawosurimiti.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0c892d881---35188993726.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/21604652336.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/73221795839.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/93761981615.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/36081518193.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/sawejunanavelij.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/94329525642.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7a9bdaed49---sagezamamexek.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/sejomorukujoxo.pdfIn PDF document text
    • http://abwva.com/uploads/files/jexuxesijafem.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/43cb88fda3a647da0854b5a8b55c4a72/61420141055.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/69513134110.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/4d759ebe185216469fbfea214228737f/jabajixagikelu.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/pafekuvu.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/4066706197.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/benirige.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e010f128ce---25462847081.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/girijofowaxove.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/93812803441.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/vodefupapi.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/bh8u0dhaebu2rt66a76vvo43ci/zifovegola.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d9200ceb6---74122047282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=is+nala+simba%27s+cousinPDF 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_off0002492a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2492A 18736 bytes
SHA-256: 73690637bb4d73a4b347855d92a55ed3fe4d3d67f5c5b7b4755f3eece743c984
font_01_sfnt_off000279c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x279C0 10288 bytes
SHA-256: d4e532c1ca368578dc3b5a705bcfc4a5c0ee22098964806b3f87d281fd6356a0
font_02_sfnt_off000290e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x290E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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