Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c18ed02f334e51…

MALICIOUS

PDF

82.6 KB Created: 2021-06-18 23:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df4eb607b7bc77f48eecb9082486eb23 SHA-1: d5f00f891333a94de7f84ecdca6c521c4e23ca25 SHA-256: 73c18ed02f334e51633ff43a97ed3e5cf7f4ffd45fa27c1020e842c30456e08f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous external URIs and links to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains metadata related to PDF generation, but no direct user-facing lure text was discernible.

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://oniceh.ru/uplcv?utm_term=continents+and+oceans+quiz+printable
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/2l28nfvq5ormj1itcnqsvspik3/58668562715.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c90354d99---xajekiropova.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/0b03258f510b6a9652f22d638844d18c/46271100706.pdf
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d35598170---70767934256.pdf
    • https://alianzatours.com/imagenes/file/nubepim.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/89ig94nhlmc1dvu3a9pnf396of/riket.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0b3bdc586---dujiguzitam.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/ad408ec114a2ae4def54eb4c84c20498/81518638240.pdf
    • https://andrejc.si/files/file/73263698204.pdf
    • https://burkina-businessschool.com/business_school/uploads/file/81175554711.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab589fc9090---37917378731.pdf
    • http://pechati-piter.ru/userfiles/file/siriduloxexigagidixa.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/974ren0gt1t52tl7a6j5mamto2/44764224336.pdf
    • http://arunimaflavours.com/userfiles/file/1294447062.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/51f572a49d1a7be6f4289d88c622ca65/gokuw.pdf
    • http://bike-aholic.com/UserFiles/file/lowowopapiwo.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ica0apvvvvlo3uaad6th0kdsj6/17727950308.pdf
    • http://luingpyrex.cz/foto/Image/file/41743871156.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_off000104a3.bin
084a177fb9dc3f6bcc7a72063101f84eb6586060b85edfd8e7e9da008bd88500		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104A3 5288 bytes
font_01_sfnt_off000116ab.bin
7d462ffcf1e11ae3ae69b35e1f7bc2f3e066aa131a45b384b5e871df557181a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116AB 11488 bytes

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