Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e50ac50c88da93a…

MALICIOUS

PDF

73.9 KB Created: 2021-06-13 08:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5214bf49b9ea9b589fd998bc88946adc SHA-1: 110c1bee892da950568b1c1263b33f3ccc8dacbb SHA-256: 8e50ac50c88da93a31a20e236cc87af036473f480eef9c6621ae658b1bf916e6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the presence of embedded URLs and the heuristic findings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://chcial.ru/uplcv?utm_term=jokher+dhon+movie+online
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac3b23f4f4---vatufemoguronusake.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da6346f2aa---62992147439.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5a87ae58---zotawerojixisurobuvejiv.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16095499511d18---42620155391.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/s0k7cbf7i6l723igu0v2a358el/jumakisonizoli.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8aa488a1---46837347941.pdf
    • https://activepymes.com/pub/file/guvepujopokevezuxaneju.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3fdc81624---77001757228.pdf
    • http://banlinhkienlaptop.com/userfiles/file/46346043449.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/41e9cb930211e2f0d4a58ca1ce67fbcb/92325703834.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83414a11de---90729088558.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/mj2hrd47oc4u8jt5e3a6fl3rrq/jisuka.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/693e48a83gu8ca5p7v4mdoq4a0/zanilazavofax.pdf
    • http://jandenzobv.com/image_uploads/file/95454978923.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f7181f898---78380043952.pdf
    • http://guojingmall.com/userfiles/file/%5C/xezipabobug.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/523b90b60fa06de303d6a511131f952e/50415747840.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b216917fee9---3326111502.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_off0000e5f4.bin
b46c499a0789c2ebeba6221d305924da85351720f71fd39103d9b2732c8162aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F4 4788 bytes
font_01_sfnt_off0000f618.bin
0e755e9de496c0e20bcdd91a08734cae474913388c047367413a18b77b16c980		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF618 10848 bytes

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