Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f922fe53ef9ebe9…

MALICIOUS

PDF

69.3 KB Created: 2021-09-17 04:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41cc10d9b8c72ed31a55ae9dd420d4d3 SHA-1: 8f8ec59521e3fd827c7b337dc7967bfb1987bb85 SHA-256: 2f922fe53ef9ebe9a2516e5d8ef9535b586dab370fdb33a1bd7ba44cfd3e9874
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm hosted on disposable domains, likely serving as a lure for users to download further malicious content. The presence of an embedded JavaScript stream suggests the document may execute malicious code to facilitate the download or further compromise the system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://elsped.hu/files/file/86356882668.pdf In PDF document text
    • http://superfishinglewood.com/uploads/files/gilokitevixabaloxe.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-12/20210912180602354829.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/8b5481aaef0b70e43ff2868da2c24280/livisovatudo.pdfIn PDF document text
    • http://salwex.hu/file/67075912974.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/35949836203.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/vnsu2ibq500ic7p37kf9d328n3/bafuruzajamogedimamil.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/84783560174.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/28526280749.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/96211237450.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/93294741892.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/zelosomipuvadaka.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/bevipixofive.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ba17cf66d---95264128752.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/6898192490.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/64756264978.pdfIn PDF document text
    • http://grupophi.es/uploads/files/87486156107.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/70181869730.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/erb6ulrii986h437vc06sgmv60/gumovove.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/keraka.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/noxinamevatumipepotobita.pdfIn PDF document text
    • http://chinahongji.com/d/files/55750123551.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/filudejebadot.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/62666024542.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/59952631418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=download+icloud+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_off0000b457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB457 10260 bytes
SHA-256: 02f1e19b4f3cd8773eb1a5a32b03894c386b1d673125d97c940625b89d75130b
font_01_sfnt_off0000cb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7F 14216 bytes
SHA-256: be12ad44ed2c983a90496bd9f54593640393d5753e34fbe4a44e204cc86f828d
font_02_sfnt_off0000eef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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