Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0893d40733ec79…

MALICIOUS

PDF

68.7 KB Created: 2021-09-26 13:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e6019a6565f0c1c9c0f109db4bba2d0 SHA-1: a50d7c97a205df48215ab21d4d1ee7d1ff66a6f3 SHA-256: ca0893d40733ec791dae54ec7fbe3eeaa614c2f0bbbb176db6ac051699e46fe4
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute or host malicious content.

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 http://hiroi-es.info/yamituki-n/uploads/files/pixalufipabaten.pdf
    • http://www.egavilanes.com/ckfinder/userfiles/files/12488617465.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dadd57d4c3---dofugik.pdf
    • https://fallsplat.se/bildbank/file/zofaro.pdf
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/vusoxezilokefetumazate.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ebd2i6h5k7ujkc0ek05sqeqese/vusebex.pdf
    • http://naso10.com/userData/board/file/rozeteponenevaze.pdf
    • http://ombs.ru/uploads/files/8463065749.pdf
    • http://pfmconsulting.org/survey/userfiles/files/xawepilisu.pdf
    • https://mgs-on-track.com/uploads/misc/files/pisizelo.pdf
    • http://finpacecuador.com/userfiles/file/45495040064.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405dd8afe60---pidavulewixovem.pdf
    • http://korealabels.com/ckfinder/userfiles/files/96465800647.pdf
    • http://dulichtantai.com/files/uploaded/files/raxokeregesedaza.pdf
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/sodebupuwebuniza.pdf
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/28174314860.pdf
    • http://norilskgu.ru/userfiles/file/74066199702.pdf
    • https://parklanehotel.asia/userfiles/file/sopesamaxafodamotu.pdf
    • http://langeline.com/ckeditor/upload/files/vudowofaligojepomi.pdf
    • https://cmflower-kkc.com/ckfinder/userfiles/files/wikifelefozurup.pdf
    • http://albertf.madteam.net/ckfinder/userfiles/files/jajekojosajizeselekoxun.pdf
    • http://intertexmedical.com/userfiles/files/kozoranike.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=two+love+you+full+movie+online+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afcb.bin
4907f13d7a1ab4c53a93fa25e87b744eee4a0ff84e630205e2c8ed0bc2d0350e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCB 14964 bytes
font_01_sfnt_off0000d5cf.bin
af50971e59af9450bf45bcddb479243660701f4321ddf90236a4ae4c2b5f4ff9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CF 10276 bytes
font_02_sfnt_off0000eceb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECEB 16792 bytes

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