Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2e2505d3996b1b…

MALICIOUS

PDF

90.4 KB Created: 2021-08-11 20:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 788488f90bd04559fc37911c3c9caf5a SHA-1: 3acce1c82eabf9b4011a3b6a948fc601d9a9bc69 SHA-256: db2e2505d3996b1bfba03888b50807fa61e4d0127890dcaf7ebeca0b57b99e83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely for SEO poisoning or to host further malicious content. The embedded URLs and the nature of the link farm suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/994c4c01972ca67500cb436e08ae9f9c/14771055552.pdf In PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161032d55707c6---87374833323.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/kufanojopajegipew.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/sufele.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/72122886572.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b35521d22bb---39465250382.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/21338422585.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/98161003669.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/71710895433.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/39479477649.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c141d7e02---93219906922.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ad1b997cf---45075261685.pdfIn PDF document text
    • http://usmleworkout.com/files/file/28277449098.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/47902917112.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cae4c05b3c---85145276647.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/nobel.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/892b8ebd4b4f04e53e694de286314f5a/botomewuwemetigumitoduxug.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16080789b89c1c---jafuro.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/69467721706.pdfIn PDF document text
    • http://princeton1959.com/clients/863834/File/13751365793.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/0c39149f4ed4aec0441087b645dc3902/tokotitupivevuxuvefagido.pdfIn PDF document text
    • http://web68s.com/upload/files/23268508606.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ke2t101jbt25gh06qif8gbpon0/jawese.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/fopud.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/65708985722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+install+bodyslide+skyrimPDF 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_off0000fd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD43 10832 bytes
SHA-256: 65c1e80fb78f53d0e7394e761b8f1eb2de82eeeb62c6e4935c7273abd0ab8fb6
font_01_sfnt_off0001164c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5E 17308 bytes
SHA-256: ae7e67bfcc7bedefec41f46494900a3142b6b4678503f807b867dfe5b36df55d

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