Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d67b4b1a5e568f6…

MALICIOUS

PDF

93.9 KB Created: 2021-06-08 21:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91b7719d498f63f6328b4407faaebda6 SHA-1: 2d064fc0ac508c10d119eff6a2bf2fbb99b1a55e SHA-256: 7d67b4b1a5e568f648426fe508b6ef791f305ebfef22fab0718c4f78abceaf26
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7313

Heuristics 5

  • 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
  • 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://archism.ru/uplcv?utm_term=grammar+bytes+parallel+structure+answer+key
    • http://techsystem.gr/data/uploads/ckeditor/files/74694481000.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97e1d70624---magimilin.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160755e2722ee2---lajizinikixokudilupawivag.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fc85bb995---gomifitazisojefidazilup.pdf
    • http://artgraf24.pl/userfiles/file/54219488344.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/drfpr6hhb94i27m1ekod4oji65/jejemivitezuna.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/2rug4nl37aglubcq50id87c7h0/ginafisatipikepotirid.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/1e0ju6m5tb3n0njs9h6mru5033/15791429007.pdf
    • http://robalton.es/Albums/images/file/%5C/worilawofivopipapu.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72b7fb034f---54256117265.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/8017dbe96f69d656c55633ef33e31d75/43283661658.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbffeb4388---78205500955.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38ea33381b---37014477720.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d4d0ee63dc0a7841e028a5fe2cd05fb2/wadebiwusikotepogenam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000126de.bin
d0331b8273ea41d019ae39b763ce60c8bf83c778359b58da64fdd44fbced05c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126DE 6600 bytes
font_01_sfnt_off00013736.bin
b63504561f15e6dea7aa5a903d7e3989506a3b9246e1dbf2eafe0282be92ccd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13736 4348 bytes
font_02_sfnt_off0001468e.bin
b0be297f193f2dbcd73d6e251465a5e0076ddf4d3bf264b498b5fbcbd6baf5e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1468E 5508 bytes

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