Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2bf3e4b797fabba…

MALICIOUS

PDF

79.5 KB Created: 2021-06-20 14:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 350ac6d891a2f98f1a958545e17cde76 SHA-1: 2487b9557db108d9aa4b18427b7f87234a79bc3d SHA-256: e2bf3e4b797fabba0fc6ac579d32cc2ff8f5332ab95d4157276de63a7f6c0fe0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous external URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://pistant.ru/uplcv?utm_term=cheesy+pick+up+lines+in+spanish PDF link annotation
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d30190496---wanigalefemag.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/migigokem.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/66466189829.pdfIn PDF document text
    • https://actor-conseil.com/files/file/22610694105.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/wikegokumavotoxanibemowin.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/4256438124.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/110ad294172297a1373e17fdef06f71d/dukoxibopakepo.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9eb532253---7643687860.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c252d45f0a---87479358130.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/doxofixunubovekarimewimur.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb80846760---35054295888.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/ceuros8ao7d5u4hs7hqecksur1/pazodop.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607aabe443cfe---89705306390.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/4f84cbf541d1a21bdf88cef2710d9390/rulebodenumuvefivirop.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/34191350622.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/hbvjghf0ulrroc6h19q9f0t5c1/fixezigub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97D 4996 bytes
SHA-256: c7dc3651be360f8841f841d49978000d0d9fc0a3e3a7f0943868478177126e13
font_01_sfnt_off00010a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7F 11048 bytes
SHA-256: 894d04ad6f459e6771be7d4b2273b683762fc105fe3966893749e1159b8217f1