Malicious PDF — malware analysis report

Static analysis result for SHA-256 448321fa250ffd54…

MALICIOUS

PDF

72.6 KB Created: 2021-09-10 07:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ceec4d3ba4e6d7016b1a72fda0d00573 SHA-1: 86ff6ae21bb005f92a0bb5cf88bb492f2cf4eb0e SHA-256: 448321fa250ffd547f496feb4afebad492fd9cc2d2263bfad7a1473aacd27653
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for SEO poisoning or phishing. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16134c13045399---21717839420.pdf
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/zokofojokefelukon.pdf
    • http://vlajamo.cz/images/file/nilumuxujuwaf.pdf
    • https://tootooair.com/FileData/ckfinder/files/20210908_D22BF21E173FFB36.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16135acb135856---tilapeniwof.pdf
    • http://nj-rshb.com/v15/Upload/file/202195148558529.pdf
    • http://falconfam.com/ckfinder/userfiles/files/85496566307.pdf
    • https://autoradiator.mn/uploads/ckfinder/files/69040855868.pdf
    • http://chrisdepanneservices.fr/Sites/cds/files/89437909389.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/4bf628770a3277794298db02c9b022c6/sekekokijibamojomux.pdf
    • http://lovesenergy.nl/file/delaguxoximamavu.pdf
    • http://whatifitspossible.com/ckfinder/userfiles/files/nutagupaxag.pdf
    • http://indianspringhomes.com/userfiles/files/raxawiraj.pdf
    • http://cold.lt/userfiles/file/9737971876.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137e01e69e34---48942031131.pdf
    • http://giaydantuongphongngudep.com/images/news/file/28060805587.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/5742a6f5f154b7c1b3affe9f227881f9/9413117861.pdf
    • http://wonderful-foods.net/userfiles/file/vemoxavogatufafilijozub.pdf
    • http://chinastom.ru/userfiles/file/95288047168.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/278c93689cc2c17209e7b0724eacad84/86482380065.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-9-4/20210904210823487531.pdf
    • http://hebakotb.net/userfiles/file/77870134928.pdf
    • http://www.motionmantra.com/userfiles/files/67637242844.pdf
    • http://southerncross-ex.com/images/blog/file/rigunowubidulewodobula.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=mechanics+of+materials+russell+hibbeler+pdf
    • 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_off0000b8f5.bin
50fe692339bc7bf1c573cf36b7c05968ced2449df908e861ef13522a5967ffcd
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F5 16636 bytes
font_01_sfnt_off0000e328.bin
2f204bb75ad722ad496c0ff92aaff459c83a1da3306a452234d9045b28ce7fb1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 11120 bytes
font_02_sfnt_off0000fca7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA7 16792 bytes