Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17e62f363b41978…

MALICIOUS

PDF

82.5 KB Created: 2021-06-25 14:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49adaa26bd4b76a0ff8d5158d9533606 SHA-1: f0d7484cc0af45b1161befdf007099c98fa95028 SHA-256: f17e62f363b419781000c43a287cc751e673e6fa2834e381fa275dd512530fc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to phish or distribute further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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
  • 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://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742b37de302---98562145730.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55764d41ba---54195717353.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b43f78083b0---69192646956.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/904a278498b2bd27b6c3b05af74eeaa2/40296290200.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/10df690578f349e634627332b07eefd1/bagumelexixi.pdf
    • http://jl-vacuum.com/upload/files/jipewexitujutiwi.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/77a1b397445499ceb29ce8919cd9f1eb/9225436586.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4e6935bfad2121d8702d5aa2bf3e1b2c/lamufozo.pdf
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/damulipoxivusasevenapos.pdf
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/nesasutepove.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/93d8b61fa6a9191bac5b2d0495f56173/pamobepeti.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/b15cde902d610f063e7bd9872c123411/79942888161.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5b14aa96d038383b34f3a6c87247ab03/finavatutovikanasi.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160750a5bd3943---6878450288.pdf
    • http://alpha-th.com/userfiles/file/77965910167.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=casita+independence+trailer+for+sale
    • 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_off0000dd58.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD58 16792 bytes
font_01_sfnt_off0000f56a.bin
8050419b49d55327b1e19b68a9591c643670e2777bd1b2860b108ff5a01e2ba3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF56A 18012 bytes
font_02_sfnt_off000124c6.bin
2f9a4dab85995e31943dd05f173e7f96bc37b97f14c31fdceb39e1435b09df39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124C6 10644 bytes

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