Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd99c81f10e942ec…

MALICIOUS

PDF

76.7 KB Created: 2021-10-08 05:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3edd852039ce21ebee8afb306a4b079a SHA-1: 581fa590557f556305788ca59778faa1270a1f38 SHA-256: fd99c81f10e942ec78bd3c504c9d73e4ef84009d6f2346a8bda3ea1adc3312a4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or exploit vulnerabilities. The document body is heavily obfuscated and unreadable, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://tks-forever.com/upload/2021/10/05/file/59311069278.pdf In PDF document text
    • http://wellfoto.cz/pictures/files/75644169471.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/34737424871.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/ditisigararuvaveroru.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614bbe456f8c6---wupediganigikafobunujoxow.pdfIn PDF document text
    • http://stylekd.ru/files/47159878198.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f78a802ecbb4ae2acef62d4a89eab279/6269110392.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/vekalebopinalizisatavu.pdfIn PDF document text
    • https://pqclass.kr/imgs/file/88578361894.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/60560875361.pdfIn PDF document text
    • https://dm288.rs/slicice/file/nafekikefutorixan.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/dozovafetujolaluzipusonu.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/dofidabevigedeme.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/10753005472.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/natejezidironarovoduze.pdfIn PDF document text
    • http://nprofit.hk/userfiles/suveletefiditesiw.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/pobaxiligi.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/28022660679.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/91323173593.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/dakujepowinoweli.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae6399c28---fokuvojekufikemon.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16136601723fe4---poromego.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a26952de6e---76084937289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=another+word+for+granularPDF 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_off0000c4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AC 18940 bytes
SHA-256: c142c42efabbf560c01d41ffd558022a781f7345d9ef56680d4787cae2b40ab1
font_01_sfnt_off0000f570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 10540 bytes
SHA-256: bbdbb65770aa0aa9fd70359f991f2e48c9f59f0c886b565e8079a55e0232bcfd
font_02_sfnt_off00010d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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