Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ddafa2fa202eb9…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 19:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01308108726fc84a2ae20c75c32601e2 SHA-1: a8d4a4fc0e13f573a75be434417d1db97acdcb96 SHA-256: 81ddafa2fa202eb964bd7bc7dd076e4e349f5680f8b4bcc07f8a1f68e754e1f4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The presence of numerous URLs, many pointing to PDF files on various domains, suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=convert+rad+to+pi PDF link annotation
    • http://safires.cz/ckfinder/userfiles/files/3192303867.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/merosijula.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/xerekupebizadonala.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/wivowawu.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/30857492021.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/vafotokurerurorozitiwe.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/vafulasibidomusulimibu.pdfIn PDF document text
    • https://masukpt1.com/contents/files/88475326977.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/37635980918.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/xijugubikukepukarig.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/dizavig.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/64e63e12a54d10901c12fcdd990c58d1/katotaxom.pdfIn PDF document text
    • http://m2m2design.com/userfiles/zujexawugufuvizotunoxozi.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16140b43b5c6ba---jezedatovenotuboxavulew.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/17720946600.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/lonexosofawif.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/74196646560.pdfIn PDF document text
    • https://projetovm.com/uploads/files/24500763847.pdfIn PDF document text
    • http://chinalabware.es/d/files/99582366749.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/kuvawixagorudiduroxo.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/nugebeganaw.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/1d2faa836bfd21176091246c38b48c28/kogixexunamibakawinebom.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/24372436780.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/19703346241.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_off0000da7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7C 19532 bytes
SHA-256: db596a5f3a324869fe59a960de31cd1ab4b471bc013ffc9f52cea7aa5f5c4395
font_01_sfnt_off00010e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001264d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264D 10268 bytes
SHA-256: 6be017ef8df3773f0db23673262dc9dd0aade33338c8d75c3517c562e79f2547

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