Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f037b5ef00763c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-08 08:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 31911fc21f2815efaaecd8abbe3debc2 SHA-1: f3286acebcd74c58fcde9652b63cd008e2513b7e SHA-256: f4f037b5ef00763ca2f25de0f892c3ad37f5f8ad688999004e14b486e6af9b9c
156 Risk Score

Malware Insights

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

The sample is a malicious PDF that functions as a link farm, directing users to various websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=jill+poole+casebook+on+contract+law+pdf PDF link annotation
    • http://staresecurity.com/userfiles/file/70893133352.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/84958166214.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/vopavudu.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/balipekikulami.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/l3dq62i47gsgh85af6t2kcoqql/ziwuradowokazevujep.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d46292e36---81377312325.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/gusorimebamozomiwazodu.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/9gc5saovfsscru2tmbd4efk1ib/lafogarimogawusa.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1473f05dc9---82235541913.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a96d4e2712c---liwujinifa.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/raur8md36hgetsms267b2q4abt/jopatedatererojizimobubor.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/lomobu.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/70263943425.pdfIn PDF document text
    • https://tappowine.com/file/17075288539.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/61720449003.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/31027701575.pdfIn PDF document text
    • https://coevent.ru/upload/files/mumonosorafolijedibogo.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210808_7FEF97A93B3EC639.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a2e695bca---fofedexipisuzesos.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/wezuderapuxuditavexu.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/92392616380.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/573aea1f45db2e050cdcd938c67944dd/79414374708.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/36q21qi3v7ongud7v4oaivm9ih/nuvobukasasos.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/a45a0b77ad69aab6f2d035249dee3935/88601922565.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_off0000d4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B4 18236 bytes
SHA-256: 75018bc2114aab9f504cae82ca192ff975ccc2c20d75a2466e982a93f92819ec
font_01_sfnt_off000103a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A3 10920 bytes
SHA-256: 0bced2ee66d6d9ddbde84f6751f08ed71fdf750fe587793537d3a9b4be9df0ef
font_02_sfnt_off00011ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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