Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25f7d9e58f0253f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-21 16:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2b2bea1e237ae79861b55a65e5afb1a SHA-1: 0a2afe093ae067911aad361bdfdbec731a935d84 SHA-256: a25f7d9e58f0253f4af962b68ad58139ece42590d47f0f7e69420b12f29ccb3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the link farm suggest an intent to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=margin+of+safety+book+seth+klarman+pdf PDF link annotation
    • http://steelfurniturecn.com/d/files/32053918281.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/gokubenuluranagufitemu.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/56375271029.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/kudowo.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/39901757302.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/rizixasamu.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/40817836610.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/72975708392.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/bamolinuzomerolozaxesun.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/jugutetonibibanipuv.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/8529360db6935dc030fd40266fabda3d/93905993843.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/pokawej.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/xekomex.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210908232847.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/46270161061.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/95255213925.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614965dd3913b---90226267806.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/lufenuluxud.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f17c10fe---1392020399.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/gexuxekupenebutenimetix.pdfIn PDF document text
    • http://heizler.hu/files/file/31283711779.pdfIn PDF document text
    • http://vina2002.com/uploads/files/xutafawipukerugimumit.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/59922222513.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/getojujogizer.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/futonitazasunabajimumu.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_off0000de1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1F 11284 bytes
SHA-256: eca61a86c9884afd3166d448bece8d0cc6b4e6301919b69ab35df6e94c8ac82e
font_01_sfnt_off0000f802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 18088 bytes
SHA-256: 282b4362a2853bebe25fae2830a182e288ee80ae828474e1a3a20dc5273027c7
font_02_sfnt_off00012690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.