Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d47f0633e15319…

MALICIOUS

PDF

87.4 KB Created: 2021-08-19 11:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5cf34feabbd442d837c6c9c712b678cf SHA-1: c68fef3950f4fafc2e80de65f7a2fe1fbadf5a0a SHA-256: 13d47f0633e153190126209d0f50552a8a8b88e43a7a63051d93552810a8ce06
176 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, with high-confidence heuristics indicating it functions as a link farm on compromised or disposable hosting. The presence of multiple PDF download links, some pointing to compromised CMS uploads, strongly suggests an attempt to distribute further malicious content or engage in phishing. No scripts were extracted, but the overall structure and heuristic firings point to a malicious PDF designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://goldway.jp/upload/board/file/mavafubexuvubirixubiza.pdf In PDF document text
    • http://adria-ex.com/images/blog//file/25706397594.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/b9c4535b3fe5b267aede20498711ca93/wusagonowatasewifid.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/11278552805.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce8c5b3892---bawitubuvo.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c90050156fe---zatanuvasofiforebe.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/80257996727.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/71833749086.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/4a7495d445cdb295a375592beb33f0f5/95489471586.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/sofowipu.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/miredukozunufatovupura.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faaedfe03df---nofutozomuvolezulubi.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/d1f4868132ce922fe819cadbc1cdace4/xidixasezawadusofep.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/91f873e55ee06124c895f73f45d0e123/tigufabid.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d4e48bc36---34974565953.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec4ef18c07---siwoledadivenido.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080df5f4c8f2---saper.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/58069654400.pdfIn PDF document text
    • http://whitepurdeespires.com/clients/b/ba/ba703c466af5784ee38134b9d09df413/File/25477774923.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/b8bbbd1ed3ef77e7128609665f6b3d99/rekimajugomamajegobujitiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=pokemon+ultra+sun+and+moon+shiny+qr+codesPDF 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_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 11088 bytes
SHA-256: 22b582cafef79b970429e93d41b347e39d7626b95bf000b75717bba448fe86ce
font_01_sfnt_off00010810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12022 17280 bytes
SHA-256: 0762bba3c2b20d724ac48777e5e3057a72302af2ab011a904dc453f19abe82c4

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