Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ebec49cea8e240…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 03:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6b3aec2b1fe5def9025db50235e7a668 SHA-1: bf5e0b4b322ef57828cdb3d9125c07a49806c832 SHA-256: d5ebec49cea8e240c607e6e21d9474640ac4223c2159178520d16e20ebc099f0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://incomingmakedonia.com/files/files/sowow.pdf In PDF document text
    • http://phuvuongcorp.com/luutru/files/31883092988.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/10245272477.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/sq81v5kra2r3i6aq8rk9bidp91/91305079452.pdfIn PDF document text
    • http://autokaryszczecin.pl/userfiles/file/425831202.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/98021714828.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/zirobeno.pdfIn PDF document text
    • http://pasaru.com/upload/files/podilebudajitukexinone.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/2633c911d81de5340767995f84c6991a/femujokutojarakufaropu.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/15634961622.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a5d199e2b---69157202115.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/90626383477.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/sotokifa.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/11821623414.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/1025711699.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109031433017206.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/judovupedisopu.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/5c1aea670016dbd48b5fa4d670b40b51/nilebu.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/605bc1fbae7d34fa7d2bc222e3caf376/vesapuxakukawoge.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/ropanijenabimaf.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/gulefapowodorapafonusu.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/70340838195.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/62812091216.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/26449922489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=unity3d+game+developmentPDF 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_off0000b394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB394 15124 bytes
SHA-256: 3ff6da452508770b4ac0fc2df8a274891a03bc7c9c1b05257d29f4ae756abc3a
font_01_sfnt_off0000d9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D3 10824 bytes
SHA-256: c233f514dc4051888c2a33107467ec9727e70ae6714acaaa3ed6093d56abaf9a
font_02_sfnt_off0000f296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1