Malicious PDF — malware analysis report

Static analysis result for SHA-256 866470d809ef1bfe…

MALICIOUS

PDF

80.1 KB Created: 2021-09-14 05:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e21e2c83afbb3b9ca5440ae4aac0fccf SHA-1: 829d4e482252446e9f1ad9a7e0926f286374abfe SHA-256: 866470d809ef1bfe9bc4cced724c5519cc54add6962ad247a4c421ee05851b9b
204 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and PRC/3D content, indicating potential malicious functionality. The presence of a link farm pointing to compromised WordPress upload storage suggests an attempt to distribute further malicious files or redirect users to phishing sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • PRC/3D content in PDF high CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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.
  • 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 http://topoint.net/userfiles/fckFile/20210912220034.pdf In PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/9698868474.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090520513036.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/89667560218.pdfIn PDF document text
    • http://haihengpharm.com/upload/files/texezijegubidamemo.pdfIn PDF document text
    • http://cuiquji.net/d/files/52202824361.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109031817107210.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/niwefizim.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/nibazoxedekovabiroge.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/fsh1rtceubtm340448u6pq7t87/samubugesutoboduzisal.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/pavuligodomoxofapewudum.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/44114594244.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/banajabajowasotefez.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/zipivexatetaruvoxiv.pdfIn PDF document text
    • http://esteel.my/userfiles/file/78871750685.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/demewuterugaxu.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/puzuvubatafuxetaga.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/61855968521.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/jugetasagafowavugas.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9e193417---91440279079.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/fajed.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/dafalurigulapo.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3c2a9a036---sewaketomazevidapizu.pdfIn PDF document text
    • https://uangraja.com/contents/files/8710599742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=best+offline+multiplayer+racing+gamesPDF 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_off0000d490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 11088 bytes
SHA-256: a89488ba69adc24000fd3f9ad0856033015217e6fd6e1e0716b645f6f1271834
font_02_sfnt_off0001068d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068D 17468 bytes
SHA-256: be359771ee568179b28fab72dd3646816682d3791a6654d83726ee3ff525ad21

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