Malicious PDF — malware analysis report

Static analysis result for SHA-256 247561748a1d3834…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 08:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9c28fc6875a7b31d7c1d8257cf4aa5be SHA-1: 5cf71df2bc7313c35721a7f3c1e1e461ccc975ba SHA-256: 247561748a1d3834c4213e4be10f00e4b0f3bab6287c535bf9929f6d0bb7607a
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f103e027b7---lovezux.pdf In PDF document text
    • http://petgears.com/app/webroot/files/file/letuzunojomafixekotu.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/zajamukudu.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ff483d664f7b4e409112deb38acb4aac/6315829090.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/29945644373.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/11048119549.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/nilusokuxufo.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/fezewowigogogilobiliviso.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/82826970928.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109051403184593.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/rizomododofimamujopelavuj.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/gonofanedifipanabevupi.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/duzixob.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/77423834830.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/35140744413.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/80140099663.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/29019970318.pdfIn PDF document text
    • http://chinalabware.ru/d/files/94656227014.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/tepofifu.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/68302673655.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/4cef1cfc560a3c3f2721bf8faeeeb44b/nidofuwuwiripolinuraje.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/nofanit.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d1cfa98f6f---98002798277.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/gubefevakojup.pdfIn PDF document text
    • https://www.phoenixdentIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ios+14+nova+launcher+backupPDF 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_off0000b199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB199 14740 bytes
SHA-256: d37160dc785b7548a375bae50027dc34f2d85d98f6833fd455b8f4a750dbb35b
font_01_sfnt_off0000d63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63A 10760 bytes
SHA-256: 70cd364f365691be46ac2b94a1a7f92b3c009fbc6ef4108035eea3d10a3896f9
font_02_sfnt_off0000eed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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