Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b25f7fdfa78820e…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 11:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0ac15c5c4ee4b77309eb8b4bf2001e75 SHA-1: 31e88aaa2d6715524c5a4c717d83bdf14667b4b8 SHA-256: 0b25f7fdfa78820ec0f93797b249c5266f7a293969e3cc3800640e12161d2ad7
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan, supporting the assessment of a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://varbackaforskola.se/ckfinder/userfiles/files/87094248610.pdf In PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5049b7144---45867419671.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e890008a314---duwesibimuj.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/50999032017.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/zilutexo.pdfIn PDF document text
    • https://siroyensao.com/upload/files/87828218143.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/nixizegeribaxital.pdfIn PDF document text
    • https://empirepin.com/calisma2/files/uploads/bekegovevupekonemomewi.pdfIn PDF document text
    • http://e-hane.com/files/53485093416.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/87708807415.pdfIn PDF document text
    • http://debden.org/userfiles/file/doludevawuxufemixoguvem.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/34b0f6be64fdd685312a373d665f5375/14256796952.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c983b3adf6---zuxivukuwobu.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/lenukuzoregisevebuse.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/80139502603.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e5e8b7a66---31198618795.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d57d1986e---81952303580.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160765fd4b0463---75630913832.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba8d5e492---44116372537.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/sk02nc15oik3jpi5s1kroo7jo3/69761503982.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/lawiz.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/34954d39cd028725d6718717c1f942b3/wenowobojewiveletar.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160733bf385a3e---segoru.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/9oomvhgpk50goq88qs1lbcvh51/2075579404.pdfIn PDF document text
    • https://samowar.ch/upload/file/57896180142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=first+aid+usmle+step+2+ck+ninth+edition+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A3 11172 bytes
SHA-256: fb91a5c0de45fcdf74bd01161ae589e50f31850e0e9c9f74d5e3822d3d2b0d0f
font_02_sfnt_off00010c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C96 18676 bytes
SHA-256: 79fd0d826a0650961c684e9a3121b9b3f614c9033a3f36b2166c49ba161acb20

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