Malicious PDF — malware analysis report

Static analysis result for SHA-256 082e3d80cfcfbccd…

MALICIOUS

PDF

86.1 KB Created: 2021-08-20 20:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a833945cd9306bf41c481e161ac42cf SHA-1: 86d9a4433aea24d4f81e7f6186a77f3b334ac417 SHA-256: 082e3d80cfcfbccdf070b63f47f9e3c49ea4c1ae3b42996a78d72ff0ab4cbea0
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external URIs strongly suggest it's used as a lure, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://hongdanhaudio.com/luutru/files/21344580045.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/8d5987139e88aecfd19ccaefa284793d/39396479706.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adba5a0eccb---dujufomovutulixod.pdf
    • https://apz-arte.com/ckfinder/userfiles/files/13650909243.pdf
    • https://jmtours.co/aym_image/files/85545291920.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958665599db---lipolavafuvijepinuragireb.pdf
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/9147150480.pdf
    • https://blugarden.eu/file/zebapamutenimawax.pdf
    • http://argyleliquidations.com/userfiles/files/junuwiwijabologebifi.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/5kp2nr441e9nif1564n6mohg9t/54216872118.pdf
    • http://sluchatka-shop.cz/files/upload/files/61722259382.pdf
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/76785757786.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/969aa90d199a2187ef1712526d1ce7d2/6427190620.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/867998807529953c44632e2053a8fc40/xozadijide.pdf
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210714105137.pdf
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/74784118668.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-13/20210513213613589342.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/3ded7365b6aa80c4e5589624882751b4/89644953711.pdf
    • https://kltccompany.com/ckfinder/userfiles/files/datalexoro.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea2a9aacf8---11684091018.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e1866a8d96d---79091583020.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/2ba433d9c853606927506c1345b10625/wobumizopirufapomoja.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/48474d4c3b00fa887242eaed146aec81/ralitixebokezodeb.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=discurso+para+los+15+a%C3%B1os+de+mi+mejor+amiga
    • 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_off0000e3dd.bin
234e820bbe82d50730c3cf86b53b0cb068a9fad8e32f30a3fe0f02eae0b06af2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DD 11280 bytes
font_01_sfnt_off0000fe23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE23 16792 bytes
font_02_sfnt_off00011635.bin
2bb1e901081b3c96410993e5ea8a9c915ea542889a758c1add83102ce5ebc29f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11635 19628 bytes