Malicious PDF — malware analysis report

Static analysis result for SHA-256 f603a615bf26f5e2…

MALICIOUS

PDF

76.2 KB Created: 2021-08-21 22:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f94fcc0cfbb74ebedea34b0b2e852764 SHA-1: 68b758753670e7ba8c405e7ff5b18174d0f9e43f SHA-256: f603a615bf26f5e27f5cfb1d49334d775d5b9f9f2dabd3af0d69e4b8d07f4ad5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/191itplk02u3tufige39ogephp/51206409474.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/jn7jjo0rjg2hutqdl3cg7q166p/52621388840.pdf
    • http://astro2sphere.com/admin/images/file/kobajelomopilij.pdf
    • https://raptiherbal.com/ckfinder/userfiles/files/23168646678.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/962384777b397ee0deb3947d225e82b7/66923289320.pdf
    • http://edsmithestate.com/clients/8/8f/8fcea3baa00381bb68ca4dcda22eb4c7/File/ferizupov.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ba3f13432---wofunisitusariv.pdf
    • http://branonperformance.com/ckfinder/userfiles/files/30308387324.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/34cd42ced6cabcee981f53e1dd8ee47e/52865455895.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160999fdd3a3bf---77144804877.pdf
    • https://fulzugaskozpont.hu/files/84636130044.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607058d21534b---bapebasudowi.pdf
    • http://chira-med.pl/pliki/78824720016.pdf
    • http://agiusfuneraldirectors.com/files/file/kifesalumiguzaro.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/7c6c0009671bc58cd0bc8a09cd6ccf8e/16789347992.pdf
    • http://df-2.de/images/daten/file/21718596047.pdf
    • https://tungqibiotech.com/upfiles/editor/files/romex.pdf
    • http://apexnepaltravel.com/userfiles/file/tivamumafodupoxuzavumobek.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6418187a3---belexafavevemepujiwu.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71ea7646ed.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b55c568ff---lolupawok.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/2dc037eca89db45fa1bfa3c6340bccd7/midogizevaf.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=main+ladki+beautiful+kar+gayi+chull+hindi+gana+video
    • 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_off0000c5ca.bin
852196ecfd5443dbc5ef6cbaa334531b7b17b84eb5138d61a01f0e2f258be98b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CA 16424 bytes
font_01_sfnt_off0000f0fe.bin
fb1b7e127f407335ea78d11d8bfcbb54ed7af360a2dea721c16ba35b3b38ab0b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 11092 bytes
font_02_sfnt_off00010a98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A98 16792 bytes