Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fff15a1a8740ddf…

MALICIOUS

PDF

68.2 KB Created: 2021-06-25 12:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b3ea33ab5c0bbd90fb43343a98a27cd SHA-1: fc3b99d84ec1c5d6d7e55e6e8c7371271703a561 SHA-256: 8fff15a1a8740ddffe7730ba23ca6d5afa86d082c0ecff3615ce2dee1ba386c3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such PDFs for SEO manipulation and traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://inwebjor.ru/uplcv?utm_term=nancy+van+pelt+to+have+and+to+hold+pdf+download
    • https://szaniterplaza.hu/ckfinder/userfiles/files/xuzitivupivin.pdf
    • http://app8itebarandgrill.com/admin/images/file/zakejabunevazegolotesa.pdf
    • https://novahealthclinic.ca/userfiles/file/88778707311.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/ce916b9bcce1254ac56e8e3781e8dc2a/83915927675.pdf
    • http://liubeauty.com/luutru/files/91008104877.pdf
    • http://magyaringatlanadatbazis.hu/dev/_user/file/wawupidinemozut.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160844cb764caf---91386189229.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/94pbabhphnrp9gb4m469lb8hd2/lixapujidupadijafo.pdf
    • http://interwork.sk/userfiles/file/maribobotifugifesilul.pdf
    • http://ahkjt.com/upfile/file/66670193470.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c0d384b8d---jofasetinumakuvepam.pdf
    • http://weberstellen.ch/userfiles/file/7960908786.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/2lkur76te1qjt3mnv7h9uq3h20/dizoruvejerokinego.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/1d8fb534748a5def8b350cb589c4e859/zulosuxafikizo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab42.bin
3c0b2198b9f21e57b6c855322fbafad4844466e8572e82c5115e0edbfe9932ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB42 10600 bytes
font_01_sfnt_off0000c383.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC383 16792 bytes
font_02_sfnt_off0000db95.bin
4d1fd63ed4ad66eef505130c4409c9fbba505882d92452fe517229736555ab5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB95 15912 bytes

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