Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b86638545103bb…

MALICIOUS

PDF

80.7 KB Created: 2021-06-07 10:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 58c90ae2df437fda6028f211f1ac75f9 SHA-1: 2493bead51958f9e9022dd40a2f87d02b03177ad SHA-256: c7b86638545103bb3f12899db44edca0e14ed1b77e7fb53f8264150f671bfea1
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. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to free movie streaming, which serves as a lure to entice users to click on the embedded malicious links.

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://crewmak.ru/uplcv?utm_term=ver+pelicula+cicatrices+2+completa+online+gratis PDF link annotation
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b4328f08180---62789131148.pdfIn PDF document text
    • https://mfdesign.hu/files/file/24591931757.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos/%5C/nuvilopudumo.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/devurajoleleseku.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085e99264b67---filugi.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/93807894345.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/zukididur.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b99ddae59---71792111339.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/jemidigubotadowugexiliguj.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/68119795019.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e596003c9d---gemaro.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/114acb232562756b8f35b23c8f981566/40368913253.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/vipivezatoworilomuroxuj.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a13f9963556---rijipetat.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5355e823e---jubiwijed.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/tuvakujuxovivej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC69 5348 bytes
SHA-256: c4643ae4fd6fd79a10354b8ab60e8d8cdcb31225143c44fb88c141918a641b6e
font_01_sfnt_off00010e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8A 12200 bytes
SHA-256: cbd09d9c4490a0b46154ae85969bead7b06829b7ea9288e012f26b9d636619f4

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