Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b0b45f22ab49c5…

MALICIOUS

PDF

83.2 KB Created: 2021-09-21 21:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7bdf43c6a0d163114478d7573b4091ca SHA-1: 6c44eb0d15853145a1b7b3499a04c5b1f06bf5d4 SHA-256: e4b0b45f22ab49c58270fbb7312dd0afd8a785cb1c79b8411a38146af11169cb
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=android+screen+settings PDF link annotation
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409ccdb3c61---18583288381.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/zobamuketik.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210913035624_27mgkm.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/57436438126.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/kufenal.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/befedabegadoko.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/wazabuwuwuzoguwemekoxetix.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a1880c9d6f1fa2f341c456519f9a9b07/47766854568.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee3b159651---77189176302.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/101231222668.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/87194490749.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/kivokikolixojopabupa.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/51765590363.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/10263629775.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/koduvitonog.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/22999087625.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/bonibotavekiwos.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vorewarifitibuzorogata.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/5a66483dc26e9e76051556a641036e62/gejimufalewonevar.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/43515889931.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/jogivufisavi.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/muxixarixomutulalevi.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210912215146.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/givabelabavowuko.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/67299991128.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_off0000e17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 18172 bytes
SHA-256: e9d79c4960516b98f78617ea1cb4f1a86b8bea24fde1225f8e05cb61e47c3c52
font_01_sfnt_off00011022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11022 10316 bytes
SHA-256: 197c8d4bb679390ea36c77aa6bfb11133080a44069e0cf06965642b4e29e0240
font_02_sfnt_off00012756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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