Malicious PDF — malware analysis report

Static analysis result for SHA-256 837d114a5c11c73f…

MALICIOUS

PDF

89.9 KB Created: 2021-09-22 12:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 989a55da8c5f0a506f4fc625ef63255d SHA-1: bbbe4dc5a5336a08b09d0c8d205d8c64871fa91e SHA-256: 837d114a5c11c73fbf170d8edf4ec6e19543cd56789d981350072b798f0eb44a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised websites and disposable hosting, likely intended to redirect users to malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pixomot.ru/uplcv?utm_term=the+best+loadout+in+warzone PDF link annotation
    • http://cachnhietcacham.vn/Images_upload/files/89069594186.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/a0f4a01f697a874a01de346fcaaaf20f/luzikidokurazobokosemuz.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16140e37670a8e---jinepetiwamonidanixan.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/40287818662.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/53726377020.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/34149541708.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/mekikokegizixawa.pdfIn PDF document text
    • http://getdol.com/page_data/file/48622827141.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/82000876512.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/sodiz.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/wovixawimilujolapogavas.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/99306835830.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d8f70ac24---zazepabeda.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/22258089075.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/15924128909.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/mefogosaxegu.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/42097988461.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/fepipalukapulapoxafe.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/15816892927.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/libexemimozul.pdfIn PDF document text
    • https://masukpt1.com/contents/files/bidanuxepujuxilipizututo.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_off0000fa5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5E 10696 bytes
SHA-256: 29baf9cd50da06e551052f397083e13c18eac570f3a2536fffff6c0116634352
font_01_sfnt_off000112ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EC 18412 bytes
SHA-256: 9da55229492860988bba82f12852eeae0255571f0b55fcaa16bae1f43284085d
font_02_sfnt_off00014212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14212 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1