Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2f4fe499f41a59…

MALICIOUS

PDF

326.9 KB Created: 2021-06-12 08:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6650f5e7636500706dee6d04fa37331e SHA-1: 01138f050e9afba7623f1fd47eb8d96674183efb SHA-256: 6a2f4fe499f41a5971fc1a877c6aa746e8a86c7f0bbfed6df8d759302634019e
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious File

This PDF document is classified as malicious, exhibiting characteristics of a phishing and credential harvesting attack. It employs a fake CAPTCHA or human verification prompt to deceive users, and critically, it directly requests sensitive recovery secrets, private keys, or saved passwords. The presence of numerous external URLs, many hosted on compromised WordPress sites, suggests a distribution network for this malicious content. No scripts were extracted, but the overall pattern indicates a lure designed to extract user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9755

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
  • 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.
  • 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.
  • 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://chcial.ru/uplcv?utm_term=eleventh+hour+cissp+pdf PDF link annotation
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/83b1b04407d0bbd31df53d6582beced0/13278775736.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90b2c151c---71064333996.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/a566a94ff017ec0e62f27399d6aa1782/ragadawif.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37bee4f61d---kabodijimamaxi.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/51105f9af69dab347005128b45b6b367/95598125560.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/xazutovaratazobebo.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cd8dcdf48---wanoromalinum.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990b8f0927e---delokomamizomurug.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/14607724497.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/qr2k8sius0rnmid9k99j9jh0ss/ganoxibikurubuzafuzep.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/kotaxoxixudazoberam.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/9f64ee7f22903639a73263cc953eb8ee/80978584143.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a02eb187c94---dumabapel.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/90155035167.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/b5f7a5dfd2786a9747daebe49dc65c1f/larafopijetizuwupamida.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8928bd1a8---rumobovarugevov.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad19d6cc84---rolet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0004ad14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AD14 4932 bytes
SHA-256: af758a10a2f59fdcb6410839568de86196b6f96a7c7940c81f1a7a05d44dcb99
font_01_sfnt_off0004bde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BDE1 13056 bytes
SHA-256: 0c1a95a4a00b4b82505ee50af752b25c4cb2c1942d73b3fd6f3147665353c35e
font_02_sfnt_off0004ea08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EA08 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90
font_03_sfnt_off0004fe9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FE9F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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