Malicious PDF — malware analysis report

Static analysis result for SHA-256 c493cd5a1bb5da72…

MALICIOUS

PDF

79.7 KB Created: 2021-10-08 15:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3a35e4f4f5cbb3ce5240cad63cfe6d28 SHA-1: 3746bdc07e492eab77046fa631e1e4cb2f9e27b3 SHA-256: c493cd5a1bb5da72f811a55ade872d77b54402f58439bd1e2708169de97053fb
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent is to trick users into providing sensitive recovery information. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users to malicious sites, likely for phishing purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://ketchas.ru/uplcv?utm_term=how+to+download+pdf+with+link PDF link annotation
    • https://proxus.nl/file/movugezazavilenalizol.pdfIn PDF document text
    • http://rinsacars.com/files/others/29525823450.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/28431e06c38b3b033b72eb005a92f1ac/joferabavilotedo.pdfIn PDF document text
    • https://moscreen.in/cmsfiles/file/16207572311.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/sejexodanurajaxu.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338090840e8---tisewigakik.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/xuwinezodubanoxedanokezo.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/wifotobomivusaxixesiwi.pdfIn PDF document text
    • https://guitarenko.fr/img/files/xubajolevezebe.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-10-5/20211005044813984696.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/moxajavadinewekovadiki.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/ludolipasibikosunaf.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/vabuvadinelarilalevow.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///kizisetixetekikulitawar.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/lanipimuruzuwewefuxub.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/56e06cfa6be3bf840648a98ec0a3381d/7498225891.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16310844390084.pdfIn PDF document text
    • https://vientangluc.com/upload/files/6629424418.pdfIn PDF document text
    • http://okun.su/upload/file/46976547095.pdfIn PDF document text
    • https://eclearusa.com/images/file/35170986529.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcff6d38ff---virisuzo.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/4828281827.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_off0000cde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE4 10364 bytes
SHA-256: e8bc6a0982a5dae3e036c19f9301344ccf6fe0859be35d29359cb729121ac3bd
font_01_sfnt_off0000e52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD41 19548 bytes
SHA-256: d3a040254a81f9ad1bbec4c18da1a15224fef345435e86b86c6e4cff2164dc2e

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