Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c5c0402f3a288f…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 14:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a50b05f3ffdf257d7f7c499021416fc9 SHA-1: 244fa9b1186efdd61c21622f3a4285d000e2535d SHA-256: d6c5c0402f3a288f5d25912c9480abf99b834341d01167dd89f6b2b122bf0dd5
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of these links indicate an attempt to exploit users through a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/uqmehn8lmnj5i9t0tu3gr68s1f/nosufuguwozodev.pdf In PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/59a81b29409c4b1345f62a98dd1ffec9/49993299931.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/9e95e0ac44e07dbd437a9bfe308e7d66/linelezapobokivugeb.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610d18e155de9---nanamuba.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/5ec6a91ae2532520665d0a966972c887/6880670313.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/13575740024.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf03cb0b6b---zozijusotufilidoputo.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e35f83d4d---puvifexenowoz.pdfIn PDF document text
    • https://hoongnau.com/upload/files/fepakemikupejan.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/53905521261.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/39070233210.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161152b41bbf3e---91474126569.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/kujoxej.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///15627169363.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/0e47c0f79c4ca224deb2f984b3c4049f/99703249220.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/reriwumumobi.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/3241666436.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/k77t2bfjlt4b24ra2eq3dedsdn/19292652736.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1790a505b---kilojumenibotas.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/rowavomegevaduzikubibibip.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160768ca620aac---konirogexifumolab.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16079174e5148c---91543155262.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210811_230126.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/67356400790.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/naxukerisejibuduzu.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/05497ee38c7bd3bc5688623cf41130a4/81173569686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=fybms+statistics+books+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_off0000db4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF360 17416 bytes
SHA-256: 225e90613cd3ed09b8e287c6909938c01869812b9764a03111b7c19573bdb5a8
font_02_sfnt_off00012090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12090 10724 bytes
SHA-256: 62a9a75b8d2452ed0b5efe05344c7bbae9633dffd6f1146069e8dcc9d8ae46e6

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