Malicious PDF — malware analysis report

Static analysis result for SHA-256 687060182465af18…

MALICIOUS

PDF

79.7 KB Created: 2021-09-20 14:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: afb2f81e93abda665bfc70478f2f103a SHA-1: 50d3de8a7a951f659d5373c219a4f3d886e3c8be SHA-256: 687060182465af18ea77bb2a59ad480cf078e459c457c92cfb1c972c1bfe4b13
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF document employs a fake CAPTCHA lure to deceive users into clicking malicious links. The document contains numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute further malware or conduct phishing. The ML classifier strongly flagged this PDF as malicious, and ClamAV also detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://infrive.ru/uplcv?utm_term=lucky+patcher+old+version PDF link annotation
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/bivejamedizolutexatugif.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/11477632932.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/24910675050.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/rudozopexekinegeridodoxi.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/zalavidezadojuxin.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/roxoxifuvenizatixojegeza.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0190883001631769577.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/xufowi.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/tulejumilixosupipolole.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/zaliwolusoxolazusa.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/kafanujigokadozuxuzokus.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/fatimexipikafululo.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/ladifomefamozarevi.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/texulibibobet.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161339ff9122cc---banusika.pdfIn PDF document text
    • http://manu-transport.com/documents/file/5271369497.pdfIn PDF document text
    • http://shophouse.info/images/files/xobolatefarolikotigebu.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d21ad8329---fasawabifakufefe.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/tesizinubutosawuvuvopodo.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/33466122218.pdfIn PDF document text
    • https://festacontinua.it/public/file/zudosumodev.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387e30c00b7---720193816.pdfIn PDF document text
    • http://pvvc.cz/files/felof.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/79246807999.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_off0000d457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD457 16756 bytes
SHA-256: 6b147aa1e8809a4a32f94ea9c0bd634fd98dca11d727a04fd40c0e847c266f7e
font_01_sfnt_off0000ff95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AC 10940 bytes
SHA-256: 9e61062209d2fd2c135232b1ffdf855fe334e72ae3a10973a24a435052da475f

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