Malicious PDF — malware analysis report

Static analysis result for SHA-256 7956839c72615056…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 13:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fd51fd9104e9b332448cdf56a5c70afa SHA-1: bb713539c6064a3d520807f1193cf6d97bb554b3 SHA-256: 7956839c72615056d866e71c6375c1adc623eddd15f991164ca98ff1c3a268cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised or disposable domains, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure suggests a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/86fc8d913e944331174953514743e4cc/votemuvakibix.pdf In PDF document text
    • http://chi-kara.net/userfiles/file/22310095810.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/nuwufiwibugobufit.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/kajokusegugagi.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/sitogisawajuwamu.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/26969033589.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d89af19d3---85963659293.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/bojiwilutatavajobap.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/1218a2dc5f8696db8338d7ff59ce4449/jikujo.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/vujosuwafobaban.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/ruximiloxirudowoguxog.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/vapuporotaliwut.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/f8e0nin1fijp7j0sdqfo8rkvn0/fituvitoberefivowuso.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/51180724895.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612508c4effff---16797987408.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82229486871.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/39198203627.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/31172305862.pdfIn PDF document text
    • http://altinay-law.com/images/file/10109806078.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d7ce9e02c---56987243467.pdfIn PDF document text
    • https://caffedisanto.it/file/zupopetefinoniru.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/vebavesobemawidanaxinuguj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=age+to+serve+alcohol+in+michiganPDF 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_off0000e48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48A 16388 bytes
SHA-256: c49205fa30fce18b352896a5136345b3de10e3a5f33230ed9397873e0d6038c3
font_01_sfnt_off00010ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBC 10724 bytes
SHA-256: 8e86551d9da9acee6499d3a0af2b1ee88f84acf06a2efb66dd2d0b63069d6785
font_02_sfnt_off00012738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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