Malicious PDF — malware analysis report

Static analysis result for SHA-256 590a40861920e0c9…

MALICIOUS

PDF

94.9 KB Created: 2021-09-02 12:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f4545d55b0b569c84f096300056f3a16 SHA-1: 5938eb01f0792efef597d520f29455b92b87e698 SHA-256: 590a40861920e0c9b576a769779f631a4763464628447044bbb02028d2636532
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://josephlillianmorrisfamily.com/clients/59960/File/14281812994.pdf In PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160812649503be---1921826610.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/28620775684.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/48652790700.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/mobomezefozitub.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/85092285951.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/73862382782.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/siwepavakafowev.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/mativimevolu.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5922d6aa8---xiligomalavupobasu.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/63262029849.pdfIn PDF document text
    • https://areicon.com/images/file/95647093901.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/92165154961.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/3c1440e1030fc8fb588e5ab9c6a36c19/wagizer.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/12392848301.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/kotupugopolijimobav.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/55517645128.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/52447014914.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/23111435352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=stem+education+activities+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0E 18644 bytes
SHA-256: 6cb37b9375a14edec4cc26d558e04024687d3a6a59bc6c4a347df95470bf6690
font_01_sfnt_off00013cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF9 10876 bytes
SHA-256: af3a8e7e89bcd9e4621e3129cfaaed39dc8bcd3b6b8d29a4ff34e6cb790bc98b
font_02_sfnt_off0001561f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1561F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1