Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0513318061bf377…

MALICIOUS

PDF

91.7 KB Created: 2021-07-17 07:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e430851e268dafa0bb683ce6c9fc702a SHA-1: 40a03ef0f716655d79e59c46390f4f8a71d18b79 SHA-256: b0513318061bf377230404209cf06dddd91e271191c73f7c00a65a858262be86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate that the document likely attempts to redirect the user to malicious content, potentially a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://perrymanreunion.com/clients/f/f8/f8644f0eb9578147d5589f75b8c3e300/File/99450402592.pdf In PDF document text
    • http://heninrealty.com/userfiles/files/tujobek.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ch8e9k52b8k37hpakdp56t1d9l/22162251692.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/9p55k77jsmg60j29srsbeu43e7/98102838018.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/bfb7392285f929a32e9945d33194a850/senupezow.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/62e81bd9bf0d86066b3ac8af67d01da6/48934948493.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/20602387285.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/eb02d94253f9efffd7e8bcd2b500cb47/vilidumosagexu.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/ef4adc1f0a30e1320062eff4e46153f3/73730354979.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/11238678055.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/koneguban.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/a167c98452dc21fc95caaf4361b932ce/16583599590.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/358f1b8c9da28213510963837fd08ec9/xagajileged.pdfIn PDF document text
    • http://fhhsclassof70.com/clients/4/42/42ce21dc30e429aa976ba070b22ccf93/File/36845996775.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/lolejesorulate.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/48507859881.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/28250417721.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/94385142972.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fb20825c9---47826180932.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/27153040979.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/33463047743.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/55776109246.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/cb0e380c7451dc20b03c63b52e511b4f/kabadurodugugel.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e43517755---vijugazogalukezobenidu.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/vuvezowaxaravezonup.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/24889585727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=project+management+a+managerial+approach+solution+manual+pdfPDF 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_off00010068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10068 11296 bytes
SHA-256: 0dfb320dc9c61bd329352aa8189bc7ce896bec5e08e2a79e1f78c1841b0415bd
font_01_sfnt_off00011a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7E 17552 bytes
SHA-256: 72ad464d3be7f5cc730f73e125ffd362ec524721e58d32fefde239657f53ab28
font_02_sfnt_off00014890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1