Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c133bfa123c09e…

MALICIOUS

PDF

100.4 KB Created: 2021-06-06 23:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97c8b633e8a86b58794450a4ee2a59c0 SHA-1: 2dec9bb17b035ce705307e914c0945dbe931bb7f SHA-256: c6c133bfa123c09e8eaa2e70d3c75200e56904d77c120755bc838be50a937526
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm or a distribution point for further malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

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://cructi.ru/uplcv?utm_term=child+psychology+exam+questions+pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/a2df6430ed5ab43f826d50344bf2b9a3/74239181826.pdf
    • http://reicar.dk/userfiles/file/remonelemitigelomizi.pdf
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/70602842122.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608992986892e---49982414368.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/290255fa1a69011ca7aeb74cc89e1b8c/29528086698.pdf
    • http://www.jindatunnel.com/up_files/file/42139229873.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/b8b09558601f23bb656fd4bea924c813/17853647936.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/0468145ee6c8f8617ae03d40bd1adc52/musem.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16070521fbdbcc---77384587917.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79989e6042---6382304346.pdf
    • http://dansensvenner.dk/imagesfile/%5C/9682537983.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/11g9oik975il21ndn53qtmqnqi/18706579538.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ajg3opmvtnq3frr6eeouejo32c/jenamago.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b530ec6eb1b---80361201648.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160832e595694d---pejimokumuwedamenalepu.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_off00014a75.bin
5f6eaea9f11826f6669d0d708e7353e8166e5f6268345395b4aa98b81fe13f42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A75 5676 bytes
font_01_sfnt_off00015dab.bin
a3ebc6a8d25cbf20a353366c64c596f4f33c5fea97d8eadf0992e1e2544630a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15DAB 11632 bytes

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