Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d6f3186d470500…

MALICIOUS

PDF

77.8 KB Created: 2021-09-07 09:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6c37776b78f3f2d8a5cfcf304748eb9f SHA-1: 50b1e3661782c3838aeace66b1c3feb0543d21ff SHA-256: d4d6f3186d47050012554e8da5e28383986329a7aec94c7e99f78d65f37b4d1b
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The document contains a link farm pointing to compromised CMS upload storage and disposable hosting, indicating an attempt to redirect users to malicious content. The presence of numerous unknown URLs suggests a broad phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/87caeoj4mthlngruula93skt87/gavezujeradenas.pdf In PDF document text
    • https://bushregenerators.com/userfiles/files/buzijipizi.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e3a7a72731---45763558617.pdfIn PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/wirakudiroduru.pdfIn PDF document text
    • http://runningrhinelanderrabbitry.com/clients/875187/File/musoziz.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///55942339201.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/falop.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/17151178574.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/jesadamiludadosupu.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160775d3ac30fb---rowaporasidedir.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/49542301032.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/87217025091.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/pesojufekorefabi.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/rf6epr4chbs2shpjf3d77c03mf/tunese.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2cdbedeaf---31660999951.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/fatulateneniv.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/55942387712.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/fasakegabobakebodul.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/91e2185da1d7449f88476c9efad64b9f/tamivawidupugabulipo.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/e616b7f0f60af3534d88c6b189a18fee/336772962.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/70359955494.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/2530633400.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/52677911524.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/nitofaxijarujenemudo.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/34719578184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=aston+martin+db7+volante+manualPDF 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_off0000c97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE192 10748 bytes
SHA-256: a42aeba22837b6202900c4f12207223faefa13b4fabc262141ed57557d1bbda9
font_02_sfnt_off0000fa56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA56 18064 bytes
SHA-256: f42044d5128bb479aa0f4eebf347d925fd87f5fc729174a699c64f4d44dd3722