Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3138ae10f9b49a…

MALICIOUS

PDF

68.0 KB Created: 2021-09-16 16:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c6e64b99601da367184895d4c3befe0b SHA-1: 43df2ed5d85aafba3117fd3eac218b975fde8fa9 SHA-256: 3c3138ae10f9b49a8476216608f4b4325179ee40049c7a74fb332b0a26073966
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=rs+file+manager+mod+apk PDF link annotation
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/xolizuvizuk.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137432be99ce---54455264322.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/buzifoxekakekumagodaxi.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/ffd53a4d6900676c5dcd8ab4ed33cd67/sefesavodezeleveg.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/47c53fb2e7de2d4ddf24dedfd6588e04/wonuje.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/zezaje.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/56964649665.pdfIn PDF document text
    • https://southafricapools.com/contents/files/lenud.pdfIn PDF document text
    • http://domainecomps.com/documents/files/60356382628.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/dadek.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/65530416468.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/77990479283.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/72825615366.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/mapuzuk.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109052228382455.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/xegubaxi.pdfIn PDF document text
    • http://test-immo.com/file/87115784796.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/13643861993.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/fowikurosanowotiguwa.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/33589343459.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/pugojixoju.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/kotipubijumexoguwologat.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/gagobimulufufotonigudupi.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_off0000ae33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE33 14320 bytes
SHA-256: a7a5625c64895674706f9cd2d203cd7723cf4ac7687f58bc69d9405ae07f05ca
font_01_sfnt_off0000d19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19E 10880 bytes
SHA-256: 98c563f2f4004404c8e7b13e37ba3ad06fad558e5be8f2592707eab3f72a3012
font_02_sfnt_off0000ea78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1