Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d35817ef325fca3…

MALICIOUS

PDF

99.5 KB Created: 2021-09-09 01:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 271a28af6c084e2f3b28ecc140f2ede2 SHA-1: 369f7d3fee306e6cdceeda2ad34e8e3d8140aa17 SHA-256: 0d35817ef325fca3779e5ab8935edce413bd304417cc924b2bff66c729cdad9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://philabc.ru/uplcv?utm_term=gta+san+andreas+pilot+license+cheat PDF link annotation
    • http://fiumevivo.it/userfiles/files/50025440469.pdfIn PDF document text
    • https://rajaunited.com/contents/files/piwik.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/wubenamim.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/87651601768.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161326af413619---segaro.pdfIn PDF document text
    • http://zenithmetals.com/files/gitowofuduwetifirik.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/81525158945.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/napufosonesemenapujo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/botoder.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/wabipilaxizaxikadukomegum.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16137808f31c2f---36014279744.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/24584037263.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/kupuwiba.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/botalagazurokotigege.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/kumovuwujatagetavid.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138f18c62f6c---51632809394.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/nojesafoja.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/63525693252.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/55170436304.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/9814598134.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/44872299218.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/tupuwizinitemazuruf.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3c2dbddf4cec380bc455453f5ab49a1f/daxafunanurikoji.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/bovubiwurefi.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/jawise.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_off00011e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E61 18784 bytes
SHA-256: 30e2c9b96580d66eb14937a84d5e6ff3ca39e67523b4c7b3761a270b439c35bf
font_01_sfnt_off00014fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD2 10652 bytes
SHA-256: f4993863d48ef17e01703dd043b7811f980fd316f9dfe1cac0686c54ce48e425
font_02_sfnt_off0001681d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1681D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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