Malicious PDF — malware analysis report

Static analysis result for SHA-256 5902359afde07b04…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 11:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e58d86a708746183e1cbb771291b0104 SHA-1: 5b488f215e0a76dae7f9c89b171b43a53fd67300 SHA-256: 5902359afde07b04976d27d39abf8559da3495c711a27616bb8cbcc45d47b64e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=best+android+app+to+learn+chess PDF link annotation
    • https://hizlipin.com/calisma2/files/uploads/8906855783.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/g212lh7prk0pcs4pq4apq2h3c5/selulebomowexal.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/34089679307.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8e9a9e929---rogelevuritozupoverexab.pdfIn PDF document text
    • http://voijin.com/userfiles/files/bakexaxudulamamuzaleput.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/70363301052.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/43794636493.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jj063n3devpc88gvc43iks9kh6/87478191955.pdfIn PDF document text
    • https://conrays.ru/f/data/87558581887.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/76800908529.pdfIn PDF document text
    • http://hotstamping.pl/files/file/83108607862.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/bitegerasokoduk.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f06b7e9fc---jizimexulifipiwiwuvi.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210918070450.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/kiwabigizolafepimowefaxe.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/gokazerodivej.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/larijegiwisurilaku.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/8451748017.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/54628226927.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/davotik.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/c4eb8f6307939fe2693f3ba1ef6ed59a/sagel.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/sekiwafedufofanowapexa.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/23276773943.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_off0000db94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB94 10664 bytes
SHA-256: 291ea0efb1426fa031fb24a30dbd43fc29748e0e1a18a4c20b169aaa8616e253
font_01_sfnt_off0000f3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 17924 bytes
SHA-256: f7c8a7de58008e0e082fd7e55696032d5c91cfc1a213b60e654569849789f475
font_02_sfnt_off0001225b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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