Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83db792e539f4e1…

MALICIOUS

PDF

82.4 KB Created: 2021-09-23 02:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 466aae5b6374a61a2833b71dabcb29af SHA-1: 64f4e48abc3c2bdc359bfef457d9aecae3bb7f69 SHA-256: a83db792e539f4e13b9795f25ba56000d5fd95a4e31cecf852d4cb51d69b0642
196 Risk Score

Malware Insights

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

The PDF file contains a fake CAPTCHA prompt, a common lure to trick users into executing malicious content. It also includes numerous URLs pointing to compromised websites and file-sharing services, suggesting it acts as a downloader or redirects to malicious content. The presence of embedded JavaScript further supports the execution of malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://hotelclinton.it/userfiles/files/41536726888.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/32e7e3fe282ce405f8e9b1dfabb02fdb/muwejatexewamigazure.pdf
    • https://pointvirgule.ca/upload/editor/file/tapinujixabozirurerijogaj.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d570593c31---jomatovefagivubute.pdf
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/55165217621.pdf
    • http://radissonhoteltraining.com/userfiles/file/94425329237.pdf
    • https://thietbivesinhsonhoa.com/webroot/img/files/muxaxuguzajoxurebizovale.pdf
    • http://i-physiology.ru/upload/debusidifesawedifol.pdf
    • https://liantoong.com/archive/upload/files/70119936375.pdf
    • http://hoya889.com/upfile/files/20210903105834.pdf
    • https://wrd13.com/force/file/81421054461.pdf
    • https://bharatceramics.in/ckfinder/userfiles/files/tobigo.pdf
    • http://orderbestwings.com/uploads/files/wemikugoj.pdf
    • http://kstarsmall.net/userfiles/file///gexejexekisesopube.pdf
    • http://daimarconstrucciones.com/images/admin/file/ponuwubaxivamafi.pdf
    • https://alihuata.com/userfiles/file/87423711839.pdf
    • https://www.natursany.com/ckfinder/userfiles/files/zexafilowitifivopozow.pdf
    • http://runwellconsulting.com/file/file/dedejosob.pdf
    • https://clubelsendero.com/img_pag/file/8959282398.pdf
    • https://totounited.com/contents/files/vitusapomafolemibirajefag.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d52430f8c---15978686879.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408727b8a13---61031167496.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=doom+eternal+android+apk+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db9a.bin
121c2a5ad59673472dab228f1a8e998f8ca8af5b653de74e6b732afdb32a3472
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 18956 bytes
font_01_sfnt_off00010c2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2C 16792 bytes
font_02_sfnt_off00012443.bin
96d89d9a97456428a8f079cbd86ef1847cd6b77353db281e9869fd18beb8f077
pdf-font-stream PDF embedded font (sfnt) at offset 0x12443 10564 bytes