Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf3a39d05c41466…

MALICIOUS

PDF

89.0 KB Created: 2021-07-27 21:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bfc57e3a62369b3d465a9cc4ce10cc83 SHA-1: 59754f8c073928d7f6d58ffcd9478d2e152b3768 SHA-256: 8cf3a39d05c41466e155e31c8a6765646f7b277d3d2f68bd66676e7ca2c18e60
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://danies.ru/ckfinder/userfiles/files/1367321674.pdf In PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609be3f30976a---74400939124.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/qlqhftr7am31hh3eiuha326je4/labunuvepomekefelije.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6be73fd18---4637807690.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/kuniradegodomigolutapi.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b092d1b6ac---wuxix.pdfIn PDF document text
    • http://pauseforserenity.com/clients/1/10/1002a5d8b3740fc7390aa1937d1ec3ed/File/74327270722.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16072e0c54a9df---tawamevalonuganebazi.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/doxefajipa.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/simugip.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/f8bb0decc7ac5e06a787e82769e8d6b6/dinixajesonunixurodiku.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/71172714790.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/865271674.pdfIn PDF document text
    • http://lagrupacio.cat/file/gutejodimaxipode.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/tulosivaxutipixozat.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/bee1c1b7a131ac147c2c58f7a4e8fc6c/vuvobelerizexetisepunuwap.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/899b2f04cbd7505327510c850e06f177/40939187385.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/42219326670.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607319217099b---fosexuropovas.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/fpm58b2lfbho3kiu4l7m629orr/gizigilunik.pdfIn PDF document text
    • http://ligneus.hu/upload/file/64565513624.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/ganubelipizevepik.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/gilafilalodaladijox.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abc750dff50---fizoritevaviduzijeraki.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/sjiuq06amjklcctu7lvuo9ob7k/sebaxivajerujuxuge.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/bigajazapabemixumaditunot.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160821d13336d0---21724887005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=dragon+quest+xi+official+strategy+guidePDF 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_off0000f532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF532 11116 bytes
SHA-256: e5b64ce2ea899367e141c438abaa6764ae6eeaac62886da3ec7de78872692cc7
font_01_sfnt_off00010ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECB 17844 bytes
SHA-256: 09f9f77868e6fcf3bd7e30a581663a1a05f0b2ebe2d8e7cd814646c7078bf2ad
font_02_sfnt_off00013d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1