Malicious PDF — malware analysis report

Static analysis result for SHA-256 86edd29a020555b6…

MALICIOUS

PDF

86.3 KB Created: 2021-09-13 22:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 085d857d45c696dc4f7db0067d9dd52e SHA-1: fcdb86e95e632306f5302b7baba740a691510598 SHA-256: 86edd29a020555b63b2deda61d2d172b7842e3a1d6bd31695bcc6d1c7cb90e44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://nomylo.ru/uplcv?utm_term=gta+lcs+psp+iso PDF link annotation
    • https://frutalmente.pt/site/upload/file/tobewexolekivepazufanilis.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/49987853543.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/37275018522.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/96851035448.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/39122667040.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/14c2f0a0d20df8734a053617af2ec62e/kenusajenoxaduvuj.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/setas.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/10180330542.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/cfc830e231426b0daf72e2e0382c4072/jovopapesavafeler.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/81757451948.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/zokubuzizezuguko.pdfIn PDF document text
    • http://afro-safari.com/upload/files/nikosofajulezajezevugite.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613191388445c---nuxinujizakadolikumuliji.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/ranuxogupedifuvimegogop.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/35192579455.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/mavefiporitigirezaw.pdfIn PDF document text
    • http://sieuthibds.net/images/files/fizojujeparuj.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/40246207034.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/zawitakopajofezez.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/84152909952.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/56db1531423049af30f0b28d7f0d213f/25988850212.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/cjr3n42te59u8ela686cv1l8ct/46592735769.pdfIn PDF document text
    • https://naves.cz/res/file/66790940519.pdfIn 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://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_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 17600 bytes
SHA-256: 140a47fc090490eb0ebbacb852cf7438199edfa09e3ed944fa3115a38afe4511
font_02_sfnt_off000135aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AA 10068 bytes
SHA-256: 447abde2ad12d9aad3c198699204c18a79ee0b8fd0912d443c1e5ce2b2eb255e

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