Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5511103a599af0…

MALICIOUS

PDF

141.1 KB Created: 2021-06-25 15:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36141364cc4f9b75d98ac6b632680cd2 SHA-1: ff6921fe38801ac216742a87f3faf5e8ed2791af SHA-256: 2c5511103a599af00b052b49335f88d9ea9481130290bc09e50c930a612e047d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often implies the use of embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bnovum.hu/downloads/83572688515.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094177d66c6b---65638823163.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/dunapevomiputogapekiwi.pdf
    • https://ubranni.com/uploader/files/fuzavigakulip.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608875b2b85f8---80852207648.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/9dd06a2e216641cda069e06937908f87/pupuzegerazafok.pdf
    • http://cheumst.com/upload/fckeditor/file/87583158401.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/fb314c2dd017ca75bd47b985827f05f2/99455510602.pdf
    • https://advik.net/userfiles/file/96549592174.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd4201d43f---lifopetisagugibabusikifud.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/39961573413.pdf
    • https://aprilboya.com/userfiles/file/99001526511.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/22c29944b64151f3dec36a5db8f5d2e1/18871625060.pdf
    • http://www.cavice.fi/tiedostot/files/97543837603.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/a0qj9uhov61qmg05ngg0mknfhl/xovugixizo.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b04bd9939e6---53595569308.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906c17c4619---84682304291.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=econ+course+offerings+ucsd
    • 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_off0001cbeb.bin
16c26901f764cbfa8312f6647e2f34ad369aade1e1faa53346c1fdaeea48dc44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBEB 16856 bytes
font_01_sfnt_off0001f7dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F7DC 16792 bytes
font_02_sfnt_off00020ff3.bin
2638a168c1ed4fb00bc6891b1d9cab43cf12548d70cc86e7003f840d5d9ae4fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20FF3 10428 bytes

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