Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eba981b683ba381…

MALICIOUS

PDF

69.2 KB Created: 2021-06-05 13:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a9005ffe7314e30c28cd1a07d73525a6 SHA-1: 9245d65f670aa7c4757284c2f0c90007433a1b8a SHA-256: 9eba981b683ba381550b50256803dd2177d48040d96d2d51541f9bc268fcfbed
196 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to potentially malicious websites, with several URLs pointing to compromised WordPress installations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://irlanc.ru/uplcv?utm_term=how+to+login+arris+surfboard+modem PDF link annotation
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/jblf695inin234emlrrfhjq3b1/vemedajuruvumakisajavumap.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/eb82425b2d97fce4a09ce7ec59c15a54/monewufiwepudisawexeg.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/03ea5f5c11f1a004b47ccc7576c33eeb/2340997134.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9ef9c8ea2011cf0a765fa775d61d6a6b/62904622448.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/bofixadazivital.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/gixelaturow.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3a69f387c---9523783499.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609241e6cc0d3---dumetapojetojigozo.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/rbjckbra761gfamc0508fda4ii/fuvig.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/02abbf63bd7a0af7e3403e7dede905a2/livizinafikufajemelati.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/615scf5nf4ti87mrj66bd2mjsn/vomadiviviv.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/mmb47pkpaha64vpl1m4r8rhms1/panujujivi.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16086b17a43592---borepawuwikuf.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/02f85aa10ab12522fcfd21a103459f50/66993329457.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D0 5420 bytes
SHA-256: cd1f46f5f9d297e53f9de26055a166c0728ea7b1f8e1d17001c0a94606198e66
font_01_sfnt_off0000e539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE539 10324 bytes
SHA-256: 616b6f26da9a8b120fcd397b96bf2985dfca2da05a88c0ac2602bcbb2e6f207e

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