Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f91b54524ac0469…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 11:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b8cf8be1c2256ae3cbe725b92f6fe9fc SHA-1: 2e17553d8d9276ecbf0175ba16d41905674c4fe9 SHA-256: 6f91b54524ac0469b84ba5fa0e87442bd7ed0cd766651c4b8c0aebc6834ca76e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613578cfbb84f---27341657293.pdf In PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/xutigajofigunevedagav.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e98bd1a2df---redalibivula.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/18226568635.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/75314619054.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f18a038e---pewedafikuzuwiguzogeso.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021092013494870554.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/13907162022.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/gegitiporusalidopigevelo.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/xoxepusozetoxabofil.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/84843717617.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/sapumudaratupesufe.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/xulajovonudofewofejado.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/rokimikikuweminet.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161450c2e4c80a---bogonoxutej.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109061252407483.pdfIn PDF document text
    • http://scsytech.com/upload/files/suwimigibudojo.pdfIn PDF document text
    • http://chinalabware.es/d/files/volaresesali.pdfIn PDF document text
    • https://fq.ua/images/file/tewopabazofuxalejes.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/53914699684.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/wazuzawopijomuxu.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/lalimiguxerenolim.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613810b0aeab8---84537486153.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/2389191261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=webkey+login+for+androidPDF 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_off0000b0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F7 16980 bytes
SHA-256: 997772a02491310147d4b93dd741e03bb06d8df12941df5f13a1f9fefc3cf6b3
font_01_sfnt_off0000dc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC47 10604 bytes
SHA-256: 40370ad079bf2bd89aac4f4d915d7ba1f1facd0a06882c2f94e6c067ce4dae6f
font_02_sfnt_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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