Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b956617501bdc5…

MALICIOUS

PDF

78.1 KB Created: 2021-09-20 13:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ae2c41b612fb4f7cd66421aa9b78cdf7 SHA-1: 6476f9d5a24f4389eb1ee31a5718d4fc43087ed3 SHA-256: 91b956617501bdc5dfe82e3043c1533b11e0e51e751f03c845a78cf57c6f66ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. It contains embedded JavaScript and numerous external links, several of which point to compromised WordPress upload directories or are part of link farms on disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely for downloading further payloads or redirecting the user to malicious sites.

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://comlark.ru/userfiles/files/waguda.pdf In PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/regidem.pdfIn PDF document text
    • http://licausi.it/userfiles/files/89089671836.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/wowoduvobuki.pdfIn PDF document text
    • https://lorus.rs/files/ruxapu.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5063d52c2---54943093685.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/60441994808.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5f7e1db3d---nerijupetazudolasujavaj.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/40942125898.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/pimoxumegowo.pdfIn PDF document text
    • http://hotechike.com/files/files/tigove.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/97880571554.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/17100291133.pdfIn PDF document text
    • http://ahknchem.com/upload/files/lixilenipumulawegupoxo.pdfIn PDF document text
    • http://3q1p.com/upload/file/21091710013795087637by3y20j0yo.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210910_21966EC5FCD2E429.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/fce2e35a24b9f0cf623964bab7c8c447/zojokuworubesuvabenuvo.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161425d389d78a---30296186669.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/ziwigezatubolezugopoxuk.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/rekekimekuwufozifuzoxi.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/85319130876.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/jenukujewenasomiv.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/jadukovumaja.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/67475967454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=bodie+kane+and+marcus+investments+11th+edition+pdfPDF 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_off0000cbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF3 16936 bytes
SHA-256: 8f0c61e9b1343981f370111e9ad3c6e321027fe1e6d393b65c1b6959fd7d9407
font_01_sfnt_off0000f7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FED 11200 bytes
SHA-256: a5ca4546715ebeea32b07c28ee2ac5890824c87f4578af52227b911dc066e7a7

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