Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2762087efe87d2b…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 01:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 03f98eabac2387591fc2915ce538d072 SHA-1: fad128b7da683aa7b307e65ec5cfe22252ce59ab SHA-256: f2762087efe87d2b8778f4998fa4efa456553aa13c60cbeb852658e7638176e1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://angelascanu.it/uploads/file/kowutufen.pdf In PDF document text
    • http://drivescuolaguida.it/userfiles/files/mofefebenug.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/34113147920.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/16109313793.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/58392944400.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d50a205ba---zowixugetizafixaf.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607214f7a8ea5---vuzowodabilorisesuxupopuw.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a703eda83be---puposowotagovepexolixub.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/refasexiz.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/novomobuz.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/86180978700.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607139b70d8ae---xefoda.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/basaxoluw.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/89105258373.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/zulozulevuxugivejelivuv.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/58351948938.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ktian0bik89g8nav5hfmdqhski/19888178100.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210803_065034.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/katogovotodeniw.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/10263822834.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad2a72b7ca---14270432813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=give+one+use+of+decomposition+reactionPDF 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_off0000d588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD588 10940 bytes
SHA-256: 1e4aa4246b6fe7c3b5ddb0c876bf4c5c7a2996c932cb2ceb3694b9cd20275577
font_01_sfnt_off0000eef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF5 18148 bytes
SHA-256: 762b345322e59eb029c85dcc88cb6e1f117b92e59d74eaf1ef2d331f122bf4db
font_02_sfnt_off00011de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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