Malicious PDF — malware analysis report

Static analysis result for SHA-256 040cfe15890b5952…

MALICIOUS

PDF

73.1 KB Created: 2021-06-09 20:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 100825534a1bbf489d2845c31b1f7ddb SHA-1: b8f4ba2f439ca84555f0d32f78e12497800f5457 SHA-256: 040cfe15890b59527a6a286d17f03d34f5314954e3600bf458ad139d82465b84
156 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to CV applications, likely a lure to encourage users to interact with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://philabc.ru/uplcv?utm_term=how+to+write+a+cv+for+masters+application
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/014261d3217e053a0f02f0e136ff3242/ruwataditirolodef.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25acd142b0---gisabizojesikowapodosiwi.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160937d288b1c9---13718411471.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071dee7881a4---diratasuvowewufi.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897c1c142e6---sivomomosuxupevalidegu.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/c9ad411cc084fa27eb0899cf549e9ebf/93022186337.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/25075dbf83ed97ea51e0fb09ec134e6d/powerabasenafib.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/71f4d24770d756f5fb66f080e9dd1016/26419855947.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdcda308d7---56985580064.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0400f56ec0---38440488481.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16090e58655cc9---1684650502.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ns1m5rjf73khgf7631b4be4na3/takedewenulorot.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/71328844186.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbeea529e0---70309223413.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ic323qeuaq8mgr954taqfsi184/91157083709.pdf
    • http://kimhoatra.com/upload/fckimagesfile/44883644602.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6824a9e78---debenura.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_off0000e1bf.bin
668a06e7308aaf33f18d66b763df9d20b18ecba1c7ebbab6dd9e47e5a2ff32b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BF 5276 bytes
font_01_sfnt_off0000f3b4.bin
7d212f97e0a349e02847d3b4dccb240ab7bd1227c744fbb71b07addc73715471		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B4 10620 bytes

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