Malicious PDF — malware analysis report

Static analysis result for SHA-256 39db0e4da0b1bf9b…

MALICIOUS

PDF

97.0 KB Created: 2021-10-23 00:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2676426ad19155cfefc79c8e1bf9fbf9 SHA-1: 6d3a0043b2d1aacb32304ef75ef042b4a3651509 SHA-256: 39db0e4da0b1bf9b59cd1e26793ec212c17dda8fcf6e3cc479cb107667574284
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medvor.ru/uplcv?utm_term=reimagining+capitalism+in+a+world+on+fire+free+pdf PDF link annotation
    • http://egyptlance.com/userfiles/file/zitonunatukomavevibofika.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/c9153005f47d2a34dd2d5e9ad88ccc44/tawidibamolu.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/xedufeluxirulelorub.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/noxafimuzomisolenujusel.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/67265242344.pdfIn PDF document text
    • http://belean.pl/userfiles/file/dokugigosejarure.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161717cc52f18d---kedeneluvur.pdfIn PDF document text
    • https://myoffice.acqualive.com/uploads/files/67231126924.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614117ecbc20c---gopomokarutunijomijisoge.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/3953999357.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/89259318812.pdfIn PDF document text
    • http://seatraveltx.com/uploads/files/29993494622.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/11871774129.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/titujilajixero.pdfIn PDF document text
    • https://rakbah.healthybitespk.com/alpha/ckfinder/userfiles/files/womozolariri.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/94218718902.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/kucu5mjsmn2h0ppk93j09t7vna/40764911975.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021092317111473499.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/9513ed916123286a4a1b0564a8055360/vumuradajakodugepim.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/ludemifegat.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/3659864522.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/68250634089.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/vamipi.pdfIn PDF document text
    • http://kaies.net/upfiles/file/wofijowibafexumapis.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef705322ec---tajinixinogisi.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_off00011091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11091 19640 bytes
SHA-256: c2881329679bdbc8f256db9f31956dcf33168fea4cff847b38491ce7143a9d1b
font_01_sfnt_off00014409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C20 11092 bytes
SHA-256: ee171be9a093f39ff0527c76f4b86a9536b8bf8743a9a2fabf0771867bda4516

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