Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8d702c2ce144cd…

MALICIOUS

PDF

77.0 KB Created: 2021-06-09 11:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 88645a3acbd7465e898603fd39042987 SHA-1: 975cc74fa35a30e1644736333b08823231131be6 SHA-256: fb8d702c2ce144cd6856ca72b5ba1b62c442b0bfc403eebdd7965355cc768fb5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The embedded content, though heavily obfuscated, appears to be a lure related to popular media, aiming to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/uplcv?utm_term=attack+on+titan+english+dub+season+1+episode+1 PDF link annotation
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/3kpaueeu3r793jfl5lheugkahh/76487577279.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/betatol.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/e1f6ee78b5cdaca25417d1bcc1b3c267/3268852555.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/xopigexezuxujuwubupenemu.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ogosulow.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ppm5rbu4qiba37308fd39d2ggm/82198846781.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/89799966518.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/14c9ab3e29f95c674ed34b008270c131/16639580950.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d380972c49---tazeboxobaxiniwukaguw.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/kepiberu.pdfIn PDF document text
    • http://chayka-svg.ru/files/37525181375.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/67948006181.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0dacd692e---18265850504.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/raxivife.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/562051f8926db19f319c78f862c6ee92/62222002521.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d29a3ac874---duwilavopaletexor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1A 4120 bytes
SHA-256: 04b20f2c3d60eb57f92601e5290916092aa83fcd6a25eed69671f0c1b1e1db10
font_01_sfnt_off0000edbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBD 5484 bytes
SHA-256: e623192b3a46df7dde0d56fb87fadb38b5c3ed662602c957e4ac3c49836ca9c9
font_02_sfnt_off00010064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10064 11068 bytes
SHA-256: 893e62220eca8e61359e078d91516f79ae9ca3a78a538818eb0c937c7335b3fc