Malicious PDF — malware analysis report

Static analysis result for SHA-256 96bd9a7a43502387…

MALICIOUS

PDF

75.9 KB Created: 2021-09-01 15:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 018a5f6f3f026de8f2359787a7059585 SHA-1: e63cf6e2ba194a962ed9abf8847d778dd69c08d1 SHA-256: 96bd9a7a4350238723a442c20af75529f39a8f5b95e467d486a45426f2e5d913
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/96c50ac3f62581289ec0e3aa2b2b6042/tazisefitugij.pdf In PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2e8926303---pipivadarukusoneve.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4df15ab16---bipanobivi.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/f1b4a0e964b84aa4bd5e9d1ffc562e8b/fexajefuf.pdfIn PDF document text
    • https://tavio.ru/files/file/50086398895.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/14/file/20210714_104559_194.pdfIn PDF document text
    • http://lakesideterracecondo.com/clients/41361/File/jaduvigafazidasifugoga.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/52811757756.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/kufolejer.pdfIn PDF document text
    • https://nistd.in/userfiles/file/jabufodupo.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/zidasawitelufetigasodag.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/71038690698.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/befa75ee7c82e1af0a96b9c58ffaab62/99534828802.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46633ccb54---xokonajozoxebagovigufo.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708b1651ae1---41647077300.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/sunab.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16105aedf4dcd5---30782304532.pdfIn PDF document text
    • http://bakoca.hu/files/file/votubulexazebepu.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/43614370535.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/famikamusefewuzowulo.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c29f4f9be8c---52849794967.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210601045105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ion+sheet+chemistryPDF 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_off0000c73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73F 16532 bytes
SHA-256: d6f1c3bedc8a38a630fc55941f475961222f3bdb00336662c015a47b0a76d582
font_01_sfnt_off0000f1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CB 10352 bytes
SHA-256: f9249428b61f6d964c6ffcc29c739d7900fd02453d15632a40babf56be87ff12

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