Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c069a73113a5e8b…

MALICIOUS

PDF

75.0 KB Created: 2021-09-10 21:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5bbc234722663db7705d05c6738bc38f SHA-1: 344ae25ddeeea4d3834e28e1fb55a5382bb3a5c8 SHA-256: 4c069a73113a5e8b813705be49f6ae7ddd889d3bfbc6b8be7b284e9a1908d531
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document's structure and URL patterns suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://motodubai.com/uploaded_images/files/luderudedera.pdf In PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137be1fd06a2---84015375372.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/9054103285.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/jolafi.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/10746085887.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/93042831058.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/gexufizidorikogunet.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/jagesojajemezeramufaxi.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac7d21eba9---resurujegevevawasod.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/eca25e406ce89e4e5128456a1ea45ab4/buniwamafi.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/32896756750.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/zejedipe.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/10662ad9b0238a0f4a61753c2e474aa9/dedefapar.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/46c3450442daf2732774acc0703f037b/52348176512.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/77470221644.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/xazunu.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/63584487278.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/baratotat.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ae4988169---7020087647.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/89583585961.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/nipixijutu.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613124a2b32f5---32756579055.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/16233857431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=zak+bagans+demon+house+full+movie+freePDF 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_off0000c11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC11A 16652 bytes
SHA-256: 764ac14b3936f4c1156cab223386c170e8a39d24232857c31cfe1ebdbb1d39e6
font_01_sfnt_off0000ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10495 11064 bytes
SHA-256: a80ad0e6e7a6b335dc678caf19c5f9141b8a083dd7a6b95ca5f73521b3083d52