Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec0e4315032b22c…

MALICIOUS

PDF

87.4 KB Created: 2021-09-01 06:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0ea38e09f2fb7ec96dd280f3b2e7da45 SHA-1: 0710c15393fb1fd779c9bc6c6f4b82bfb122cb60 SHA-256: fec0e4315032b22cab4758d12843a99abffc8fff4128f78f4465abb3486e0b94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded JavaScript and numerous external links, many pointing to compromised CMS uploads and disposable hosting, suggest an intent to redirect users to malicious sites, likely for phishing or malware distribution. The presence of JavaScript indicates potential for further exploitation beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=gba+bios+android PDF link annotation
    • http://spy-military-labs.com/userfiles/file/26501894694.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/34959304647.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/noxixezuxeroridi.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2043877bf---49416930166.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/79faf1cbf5a38b302bd9c03c046fe66d/zovixidowo.pdfIn PDF document text
    • http://chinahongji.com/d/files/6585835195.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/fomofeponamuxo.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d4549de82bd25b23a37575f9fdb10d03/wexudujutalalovagudugas.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160deeb0ead187---57897908247.pdfIn PDF document text
    • http://learningkey.org/userfiles/xodizimaropazogu.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/182b519ee7b775ca3d994a3c44d2b262/bebipexawonaborijoxigim.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/baparipitojifesakefisapuz.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/rokidusadokorefesivexofun.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/61713734601.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dc17b2719---78553269590.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/83561183373.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/kufazexatijal.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/vedipepimivewikevalutoges.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/dabezijalum.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f113a812f44---lubabimofev.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/c2829510de8415237c8d7dd058ebdde3/174075244.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18780787532.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/u4rtddcoqesu2ghjemhr41bfqt/jijek.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_off0000eff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 10144 bytes
SHA-256: ace0b2062db6d89a4cf4a56c67003243bd2d474151de7b439cce2b320d00b5ae
font_01_sfnt_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 19032 bytes
SHA-256: a9a59f97c480c5064c99e4bc9ddba5e5ed7fd577f06561a493ace79bb64a9d04
font_02_sfnt_off000138b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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