Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08991fb68d2d46d…

MALICIOUS

PDF

73.5 KB Created: 2021-05-27 18:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e04dffbed550074c5629293040666380 SHA-1: 49ac7cf659b164baf7b62227c5b556f1400af108 SHA-256: c08991fb68d2d46d98bb177f617f65b0d67db38ab5fde8c099d236d6ab62867e
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

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 http://airconbank.com/upload/fckeditor/file/4035360851.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/6875e396d0338af9f1d43389564505b1/64807773094.pdf
    • https://jahanchart.ir/data/files/file/silejunufezipinazede.pdf
    • http://nsdadventist.org/FCKData/file/82445656337.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6a4cd50d0---pazasapevipogupigazotegi.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a37a72abf63---38179721041.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6fe0b221a---xituwu.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/j9ma6qinol19kad78ng9jog74g/merumutorok.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160830877586d5---37974374426.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086412b8db7c---lalubifexejidibuboneta.pdf
    • http://geneolock.com/locktactyuma/userfiles/file/gitefekikevovemuwo.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160813df3112fc---radofimazofuvomoses.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/63dc85bc8ee5e4f0a20dee681b5422b7/rusumalim.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/bs2jrsfpeng7gd7eut22ie6d80/28355528479.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ejercicios+verbos+gustar+encantar+interesar
    • 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_off0000ddd3.bin
58b0596480473409db7afa52ce0d4e6eb8c94848af272ab4a2dc82a69889504d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD3 5168 bytes
font_01_sfnt_off0000ef8b.bin
136eb1ef9df65d035e77978b7e1012f09543e56f29c5c7b24f96969346732eae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8B 12204 bytes

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