Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d1e6919bf3309f…

MALICIOUS

PDF

66.9 KB Created: 2021-05-29 22:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a43963bba9b2260f9c0d396f696c072 SHA-1: 59eb2f119a7d19e68d72446152ceabb3b5726a18 SHA-256: a4d1e6919bf3309fe01948fad6b10771ff333abd8065ef04cf0469b9aa8ba629
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a phishing or credential harvesting attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using disposable hosting for these links. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classification strongly suggest malicious intent, likely to redirect users to phishing sites.

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://huntic.ru/uplcv?utm_term=craap+test+worksheet+doc
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd8fab1ae1---72716507011.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/1o5ekh13u75e328f9a5brmr69u/13761688111.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e56f9189a0d7a3496772464e3a1d405f/81516370051.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16078401ce9989---80496207490.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/5925a36fd412ee7bffa81e573d70a605/10120855284.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/k41o03hrspdmie5ljo07h4f6qv/nifimutexejiwofubew.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/3d153fe380d1ce890fffe17cf46b94c6/damovikidi.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a388c8c06dd---70888499796.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/5un0t348repkf6t6h1pnjtk8o1/baweviselozan.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16076a01fe45d0---60478111518.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607793cb22c40---xetuzunuzijidodifaxewovo.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hjqueeuq1igs690b615umf0bj2/momulugon.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/bf9qi7d8fni5ib164cneia2e44/gapumonodirumidala.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866deb226ea---82042944924.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_off0000c7b3.bin
6e00bc8a8a92228d4461593062a04d4939129e243e4b075eb4251ae81bf14c60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B3 5192 bytes
font_01_sfnt_off0000d964.bin
feddc1201d13e95bc468bedebc91b2cbe5182894732e73da2a7d331de0866bd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD964 11508 bytes

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