Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f54c12fe96336a4…

MALICIOUS

PDF

74.8 KB Created: 2021-09-08 02:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e30ec14ddf610ef693a226209b9ca6a6 SHA-1: 963e32b1caa9b041e21ffe519b8e0069fa925f12 SHA-256: 0f54c12fe96336a45766ea69cb7e53f09bc415dcaae78a394c7a164b5ad00a14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites and disposable hosting domains. The presence of external URIs and embedded URLs suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=circo+voador+da+fisica+pdf+portugues PDF link annotation
    • http://thanuyentea.com/ckfinder/userfiles/files/zalisejovisuwafegi.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/nadedezifusuvunog.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/lasum.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/n6u0k9f0jdgvcvveu0s38np4iq/79492118751.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/junulenemesara.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/sisalemarujozana.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/jamezetebegava.pdfIn PDF document text
    • http://gerocuki.hu/user/file/fodiveju.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/76562445005.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367764c6b02---niworumoburuvinataxob.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/fafewivedejopexiguxi.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/92763197575cb524c42dcfee8253d49e/bajebukupuliwokisij.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/mixodafe.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/21094181512.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/46444986315.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/b2ab33c4a25d5f0907fc5026c1f50fc5/47851629674.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/gatesul.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/f09f1c35b202069a5ed5e117acfe723e/lejikizuxelesesogumotin.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/54780784947.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/95684992468.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/96103626512.pdfIn PDF document text
    • https://plasy.com/uploads/file/50412735789.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/loxajubeso.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_off0000bef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF6 10840 bytes
SHA-256: a51a17154258daeed3318980653237866c97448b78bf7cbaea8a856c7a06acf4
font_01_sfnt_off0000d7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FE 18016 bytes
SHA-256: 143d09b377cebcf63913fe32b7b25eb200042a1a41006ca528d46bf7e34d5a94
font_02_sfnt_off00010681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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