Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f96ba6e10f8a56…

MALICIOUS

PDF

80.2 KB Created: 2021-09-21 14:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0e72ba59a6910cbd6773d35faca6b7b0 SHA-1: 4b9913a21f9bd2848a4f7f2f3c093285dc9b4567 SHA-256: b4f96ba6e10f8a56aa27a2604762d0b66810dcef0bb788a09633b79f5cf478c9
216 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics suggest it functions as a link farm, with several URLs pointing to compromised WordPress sites and potentially disposable hosting. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly indicates a social engineering attempt to trick the user into installing malicious software or providing credentials by impersonating a necessary update or extension.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://z87992961.com/upload/files/20210905021025.pdf In PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/pikinisuzorozejuvitenubok.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c5d6f27aa9553fc4ca7cffde7f582a29/28173564705.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/vosadejubupilorawima.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/bafosijurutikefesigaboxag.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613e502791441---85794078577.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109030701373798.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/sunigoxajezevet.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/77073953882.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/73231126900.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/lewikuj.pdfIn PDF document text
    • http://gyliver.ru/files/files/matipi.pdfIn PDF document text
    • http://xn----8sbkebltdkywd.xn--p1ai/ckfinder/userfiles/files/labigawotowisowuxekeviji.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/riladujuvozarojil.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/a0c7f2a08406d3079f73829df98c0573/77660109811.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/rivimalopodoro.pdfPDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec941ead47---62498186452.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/e66cb099fedf5ddb9502c2d3a2182d8f/detazofel.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/74706826193.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/tafipabuxeduvaji.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/60286664187.pdfIn PDF document text
    • https://mediaskills.rs/files/65658125548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=setup+android+tv+with+iphonePDF 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_off0000d402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD402 10604 bytes
SHA-256: 6b946c8590b2350c17bd64e3406eafcc4ab7e52f190da35948a62a6654dc27e2
font_01_sfnt_off0000ec32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC32 18160 bytes
SHA-256: d7a7b268daff2c0375a6850ec8666e4778a3e071d451527bb7f454b8e12409dd
font_02_sfnt_off00011b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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