Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9214a2ef3f82a3d…

MALICIOUS

PDF

79.8 KB Created: 2021-09-08 21:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 37e2d238023f487eada47f4e72060610 SHA-1: 549adb41c1a53ae6bd191aede615848f7d2f97ff SHA-256: b9214a2ef3f82a3d8a07d06189c7428d379a7ecc5ecd0ab7edb1ce2b6250d446
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised websites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://jobtiara.com/files/files/95335361221.pdf In PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/89849375997.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/pezujizatuvufid.pdfIn PDF document text
    • http://garderoba.sk/images/_file/28069472271.pdfIn PDF document text
    • https://quasar.mago.ro/ckfinder/userfiles/files/27192558683.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/nawigukoxep.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/wawasigakuzofidurofulinax.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/7ecc92dc9186fae84c129378f1ac6108/6910898003.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/nukufurezaxokesolus.pdfIn PDF document text
    • http://techmechengineers.com/uploads/xadaxetoli.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613833c78bd77---pexusebuveton.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135f0ee010d2---83174132233.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132e8f61c133---zolafikuvelividazovu.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/15448150695.pdfIn PDF document text
    • http://mfcpavpos.ru/file/zojuvukudutasu.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/34005317317.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/4820463287.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/17390410069.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/pavolavegujejaza.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/43183050436.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/nujekosulobaxodedumi.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f840663dc---lufopasadedusaduwejim.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/31152434200.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/90301825817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=markup+and+markdown+word+problems+pdfPDF 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_off0000cd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD35 19312 bytes
SHA-256: e81dbe8ed96186d076100cf9bf2d6e8e0ad033b9d9244563f7ff7d37baef2473
font_01_sfnt_off0001005c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005C 10880 bytes
SHA-256: 999c8822749883ad05fa1cd864f99d3bb403979b10798503a2e9860f4e1361ae
font_02_sfnt_off00011953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11953 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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