Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf942f78af5ff5b6…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 03:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a4ff78332671e7143aabbba9450d4c1c SHA-1: 4e38aff5ef77392b514cd7a7ca7ddd9b6e87865f SHA-256: cf942f78af5ff5b60f1fccc6f5189daea1f370c108e6e1a308b6f7802b5d1937
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=re+zero+season+2+free+online PDF link annotation
    • https://paymentor.nl/uploads/file/33921086712.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/48895470273.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/78724487180.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/903992f78b25981ae58761269d7425e6/lelogoposul.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/32044028724.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/89759959600.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109132211305607.pdfIn PDF document text
    • https://dintek.eu/uploads/file/zupokumalutedekijowutev.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/85149742082.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/39574688155.pdfIn PDF document text
    • https://maviet.vn/upload/files/napel.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161363a2a89fe8---gitumesumov.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/devadefogadasigetaso.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/43807298088.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16130c1e7b5f19---33769757225.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/43843602089.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375eccd5d2e---sumera.pdfIn PDF document text
    • http://sbkf.org/files/files/sanurum.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/10110399356.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/e726c0b37715e9afd086dc7dbb9f1668/fadekixep.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/kudexisojewikadovosoner.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/2005165395.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D9 10336 bytes
SHA-256: 32dea57e324059103e1f95ffba1cdeeadf15d89eec02cfa4c42e9c02a0ff2c9d
font_01_sfnt_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 17212 bytes
SHA-256: a3146864a8a03d56e51a94cb41e5e085f7b926f9fd7f5ede1473ea87c5e4ab55
font_02_sfnt_off00011e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1