Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c2f39340b5c386…

MALICIOUS

PDF

82.2 KB Created: 2021-10-11 06:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 301c0bf6faa94b855da47bc19972ff94 SHA-1: ed97f49a4c611cd9e21a230cc919234d4f504e32 SHA-256: 86c2f39340b5c386f6d764abfbc41c05d64b064752d0ad048c8792eba74a7f9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and compromised upload links indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://queure.ru/uplcv?utm_term=why+are+my+prayers+never+answered PDF link annotation
    • https://upaspor.com/resimler/files/kolikiwasepikiraxib.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/sojenigilasurusisibefofi.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/tepemotusimuzememoxegonad.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614e25749b4b8---tikusemiwiwegojo.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210929161640.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/betolinutinaxig.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/924c9a473960f44377a35cc1699b7ef9/kavekutupebos.pdfIn PDF document text
    • http://agilesolutions.in/uploads/60638596789.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/41794978815.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/22162408697.pdfIn PDF document text
    • http://trieuduong.com/images/Download/fupubirujadolomurik.pdfIn PDF document text
    • https://bukkosdiskola.hu/files/file/73213130823.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/pikaluwoloz.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/65120788986.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/febuwuturolifulobil.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3gtgidjo8edm3g3sk7si27d3q6/816056540.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/60606679120.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/wuwugerabotivixupafepoxi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141117534663---59698070402.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/revazenonufem.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9cebcfcac---vijutita.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/32126942793.pdfIn PDF document text
    • http://www.moyekolodin.com/files/jeveda.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_off0000dc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5E 10560 bytes
SHA-256: 12fb93e44a23e16ba6f98514c1b060c54b34610e23a0de896501fd13e6307513
font_01_sfnt_off0000f44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44D 18284 bytes
SHA-256: 23f3cc9c63b03b04f7c523790c9bd36208bdf6ffb8cd7419baa1f2d85cd808f0
font_02_sfnt_off000123a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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