Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf801966836a79d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 09:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c5ea1ebd7db3bea2a5c210e03801569 SHA-1: 57c9cdc2721641b2904b67b7d0a02e2c5c7383c9 SHA-256: acf801966836a79da7e589967aeb630f921bfd6e336f0abd0920b371070a9dd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate this file is likely part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://ruihuitax.com/files/file/76899996774.pdf In PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/8e5dd3be92bd7941543ef88ded070de4/86949919862.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdb46d83c2---87352460969.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607033c96ad75---18582277617.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///zujuju.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b820928962---fivuda.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/wukebasogezevom.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/15478910022.pdfIn PDF document text
    • http://wixoon.hu/upload/file/fukiragugineluvenerazafi.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/benalubozi.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/27750389540.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/39959788096.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d9cfa25a5629eb2236f0ad5b0606043d/63809375362.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/17880434864.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/33200231254.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822be876cae---tugus.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/7313613634.pdfIn PDF document text
    • http://hpc1970reunion.com/clients/3/3e/3eb4c5728feca7eb79feed4eed44c519/File/jidosivifo.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/n90d5j3an7ui9cov5v1thk17de/15302727015.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787467cb182---42973301623.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/ditubasikosedinawukurojiv.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/lexarolef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+reappearance+of+christ+in+the+etheric+pdfPDF link annotation
    • 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_off0000e4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC2 18088 bytes
SHA-256: 6fad49bd25b89b8f4090b2f8a7ad480bfdee5960f4e8f4f10289efcb0f51e598
font_02_sfnt_off00012c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0A 10636 bytes
SHA-256: 3af4460c4be832142139f6d778b3ef0361971de22df95ff990a84b12a5e48b2b

Open this report in the interactive analyzer, or submit your own file for analysis.