Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ebd7e154a60a24…

MALICIOUS

PDF

62.6 KB Created: 2021-09-13 12:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1debb552878f8370b668f56ab91361d5 SHA-1: c8b3cbf56807251599652b2a79e77e7121cd2f63 SHA-256: 90ebd7e154a60a242bf90fcc4d869196a3fdaed243cbbe8fdb81ea41b11311b1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with 22 distinct links, many pointing to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a tactic of using link farms to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7964

Heuristics 5

  • 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
  • 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://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/tebebobuvu.pdf In PDF document text
    • http://nifaelectronics.com/userfiles/file/66456640329.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613470ac1726f---tuporafidowibaxufadu.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1200dadf822fb3bd0c355692abc466d4/bamikuxeluvakegizojujeb.pdfIn PDF document text
    • http://unseretochter.ch/images/file/demos.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/75148512181.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/t64l8eomn35uasgsc2v1nksqb4/zexunofat.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/jutux.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/99862590283.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d5030aea1---32691157203.pdfIn PDF document text
    • http://konberdbio.com/upload/files/60856662378.pdfIn PDF document text
    • http://szhlfz.net/upload/mubagatotul.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/57655981216.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/45736324103.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/fisibutulapame.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b81ea64bbf---ledekew.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/23489560741.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/diriraji.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/kikidu.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/17769531352.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/sivaganasipuwas.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/51032534805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=vidmate+apk+download+free+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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