Malicious PDF — malware analysis report

Static analysis result for SHA-256 27fba459ad6a3f03…

MALICIOUS

PDF

125.3 KB Created: 2021-06-18 13:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c638d0bfe6e23652ede5df3e54ec129 SHA-1: 878c5bef78b9658380cb9bc6d1a5ca6e48906b24 SHA-256: 27fba459ad6a3f035d8b735eec34bf43eeaac2a09a57ca8f94f33d8ff3d24a21
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The document body, though heavily obfuscated, indicates a lure related to 'Toefl reading skills pdf', likely to entice users to click on the embedded links.

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://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/fa1f288498bfb1e39425dcb17aea87c4/gekufagipawer.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/339526ad5a8fe8b7c524b739020e28ef/1013732879.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4nk0o5s69kqq2cofkg9veckbmp/gemevojuna.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dbd6682a175c7796dbae49eb3e342f8b/86573435056.pdf
    • http://sowitech.vn/upload/files/jiperu.pdf
    • http://aftckwt.com/uploads/file/kaxerosefa.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160869935e6830---60025684614.pdf
    • http://klasykarozrywki.pl/public/images/fck/file/zimif.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b49d218fc9d---51113454880.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/81889987424.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/5aa25e4e397848d93ca0451b58dc19e1/mazewapobubati.pdf
    • https://gute-reise.ru/i/files/files/fezipudavifiwefaxaxem.pdf
    • https://tidaksusah.com/contents//files/64582310762.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85cf487dc9---71183752169.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=toefl+reading+skills+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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001abbb.bin
3a66b2f2a37dab95b885eb88b3bde4ecd3ef1e3f359809a4e851cfeec8d1faf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABBB 5220 bytes
font_01_sfnt_off0001bd97.bin
f634695493f675a7b0d8a2eda7ca9ec1b2bf18aa5c7a7646ec0e9d4e8b3836bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD97 12520 bytes

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