Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f3e7b393877083…

MALICIOUS

PDF

82.6 KB Created: 2021-06-11 22:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee27aa003457991240f5d38f0bda04c1 SHA-1: 430b00dcf869e268328e1442fbfdf851c83fe517 SHA-256: c4f3e7b393877083097aa6d42af8d60f6c75e406913f02a0e1e381a0a6c72049
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

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://laborke.ru/uplcv?utm_term=ba+tamil+books
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b564679e38b---virabarobudekotujoretil.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160718693064cf---41158107812.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/lfpbgmqc1g42eet3hkvq3gm8d9/butedoxigenozerusoxugaruv.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/fca727ff9a95d7707f224376d3d78e98/97811978056.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9eb676d3f2---kujoxoguganoguso.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/ec49373acc5789f0cb6cf09f7b81c38b/64904417203.pdf
    • https://twr1115.net/files/fckeditor/file/18612520268.pdf
    • https://anukulagrotech.com/userfiles/file/46207977176.pdf
    • https://proxus.nl/file/14405980829.pdf
    • http://cgeminfos.ma/upload/file/36654580034.pdf
    • http://anaminfo.com/attachfile/file/ladezuwuvupili.pdf
    • https://prtl.pl/userfiles/file/59553490693.pdf
    • https://rimsball.com/ckfinder/userfiles/files/37644638814.pdf
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/datexamuru.pdf
    • http://castrolmintabolt.hu/images/upload/file/93063689122.pdf
    • http://www.deep2001.com/images/library/File/48349769467.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16071441b361dd---44604024708.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec08.bin
27da4341fa15fe64e27cb49cc81defe9f7ca4845fb551dc8bc4e7fa201e642df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 4988 bytes
font_01_sfnt_off0000fcf3.bin
268eeb0cab245cd06ba90faf8d32e9005cebe3d11fd4ab9d5299bb937f86c9de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF3 10860 bytes
font_02_sfnt_off0001221e.bin
2ef96d98dd13bed918bae5c507ebaa8410c40d17f90da6d7cefe28cab3cb7ddb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1221E 7968 bytes

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