Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba190c8e6439268…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 09:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2cf1e6680e54709126bfaefb0935ace2 SHA-1: 86dfab0c06ac733ceb1eaff5b2671fd6720c8509 SHA-256: 9ba190c8e64392681b12c36e6b74796b30513feccac0cb381ecbb472fecf79b7
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 for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://archism.ru/uplcv?utm_term=brookdale+house+care+home PDF link annotation
    • http://chatfieldfarms101.com/userimages/30606059982.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610096f1069e2---68181626346.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/e5a4964ea9dc528beac534b08b8330b7/53308491288.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/jafusumixoji.pdfIn PDF document text
    • https://brod-plovdiv.com/images/39918816838.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wisujibulugireriwuduxo.pdfIn PDF document text
    • http://shamayachts.com/upload/file/dotujuriretiped.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/rujemegotefojumisobed.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9ede0131a---xamitaxitotemedefor.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160cda16e164ef---84256952555.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/fapetes.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/17487158235.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080b5d0061dd---zegekasiwagofi.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ede07663a60---43509309702.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/3401083e6fc0fee9cd1d1b8bb0534cd8/78433355791.pdfIn PDF document text
    • https://htapigroup3.com/contents//files/9568596542.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/7bhgeaomespkt35d5h8c00ftg6/33933144418.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/rukaselubuvogedewupota.pdfIn PDF document text
    • https://beaszemin.com/files/80558806930.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9938f15fcd---69986120680.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6cc0c2e32---ganivowu.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/zegexadowadefixejada.pdfIn PDF document text
    • http://ecoevopublisher.com/files/upfiles/file/35183177836.pdfIn PDF document text
    • http://wernitznigg.at/files/17126498119.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/sirovi.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_off0000dd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 10584 bytes
SHA-256: 143b26173f0122b77d2de582a22e3eca51a7bfead4e53f502b4c1ce4590ec101
font_01_sfnt_off0000f57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57C 17436 bytes
SHA-256: cf744a7381ec4f80cd74e57ff93fb25f423d614b7e2aeb0e0ea768e29603dfd1
font_02_sfnt_off000122a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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