Malicious PDF — malware analysis report

Static analysis result for SHA-256 671c6edb2cf76582…

MALICIOUS

PDF

66.6 KB Created: 2021-06-09 21:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39726c179436f776ef89db14d5b71eff SHA-1: 8f50abb66f0851cbc2a9062faceb9ad9e680690d SHA-256: 671c6edb2cf765822f005557edb6d3d83b6f4f1dc8f2ddcf11da29c242d0526b
156 Risk Score

Malware Insights

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

This PDF file contains numerous external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a 'link farm' heuristic suggests the document's primary purpose is to redirect users to potentially harmful external resources.

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://infrive.ru/uplcv?utm_term=spring+hello+world+example
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/695fc5a6f7289775011d15049d2951c0/10424687540.pdf
    • http://reicar.dk/userfiles/file/remonelemitigelomizi.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607913c988314---60837386962.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609280d529753---xibepogexinuvofebuben.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/932f6b5cfe08784289c7487d96a2809e/19866002515.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160725cdc7f666---famuriwijajularinoduzog.pdf
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67659567975.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/d4015318eb9411906d2e1cea753d0073/53226412126.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/e39861b71745763166592453b8f6ef06/mamobezogijezeluzuteroni.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/qde4ul1t89jtrjm0b7flcsq2s1/dakubal.pdf
    • http://mosvag.ru/img/lib/file/sukevep.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b248f1de964---94754078145.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/df7af56f7e519e5d910137fef2a02dc1/60712809854.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/cc9073d8302b8d135546ee12e72f45e9/zoxiketexela.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e82465115---82551036736.pdf
    • http://dzbnf.com/upload/file/%5C/waxupexirutarinupuvoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c678.bin
e604410784cdda18775b4007edba59a4e214a0aefec71289b54d3c3a8f597144		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC678 5460 bytes
font_01_sfnt_off0000d8f2.bin
b85a708c417f749fe0304ace44e4e287c123f8e6076c9493391e462f2383192e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F2 10724 bytes

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