Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e8268c988e9f53…

MALICIOUS

PDF

78.6 KB Created: 2021-09-06 01:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6de4c7f0d5e0633f2fa2c2edfb9e66e7 SHA-1: 723a76c6b1e5eb4a0da469f8b873883d2ffee94f SHA-256: 80e8268c988e9f53a3e2ca0944913c96edb85fbedfc4d784171f508d592ddf0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The presence of external URIs and link farm characteristics suggests an intent to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://chcial.ru/uplcv?utm_term=iz+radar+24+manual PDF link annotation
    • http://www.gieskestukadoors.nl/ckfinder/files/files/konumenizifabifakavater.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/78438610354.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fcd2af400---demabedufuvobagepuveren.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/mo8lps8mbafv46lb7h5vlitka5/zuxujomobaxisutajiwojopun.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210717_DAECAA0DB9E3075F.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/22627689336.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/88994561484.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/xukadudakam.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/17640760792.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/xejar.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c31ab71ab---loxatenube.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/nugakulitukaxeratipidiw.pdfIn PDF document text
    • http://seamacros.com/upload/file/58468013028.pdfIn PDF document text
    • http://starma.pl/files/file/sozuwan.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa3af4bb83---52075033736.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4234b555c0---zodezowavuzofebew.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608358c188e37---sotosufasubup.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/9111334444.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ba2285bfad6f4c869bf2661ad885d1d5/47268519181.pdfIn PDF document text
    • https://eetravel.net/file/19009679496.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/lokuxutodinuzelubadis.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/35579430947.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16107471beff9b---45978711432.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_off0000d163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97A 10108 bytes
SHA-256: 4cc2988719103911a82165c5f9463497d3224475ee2edd429d553575a7b082ea
font_02_sfnt_off00010001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10001 17408 bytes
SHA-256: 16e7f142fb7ca0058cf7fba717fc068fbead16ba109394bcd2369bf13f3ee45b

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