Malicious PDF — malware analysis report

Static analysis result for SHA-256 892106cbc47a4dbd…

MALICIOUS

PDF

96.0 KB Created: 2021-07-31 09:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 77be80d7389662d87651eb7bb2224acd SHA-1: 431337de97d3f5824da6b97fdae8c015eb30e0eb SHA-256: 892106cbc47a4dbdc5d1748901b557d936e3ac06887624994345bab073536bb5
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and presents a fake CAPTCHA to the user, indicating an attempt to trick the user into executing malicious code. The presence of numerous links to compromised CMS uploads and disposable hosting suggests a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jaht.com/userfiles/file/pafivisajesej.pdf In PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5ba723cec---bejamumulasogebavitiwi.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/wasam.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/pomusuduruwelafuku.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/271477528043c5d4007d5d4ff5e1f228/mukirilenipisivunogu.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/65854984829.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/88107424712.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/22mr1icvg4qk5n8fechav66266/lefolozujaru.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/eb6aa32b5e0256fde9ab672c46635784/26775604885.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/35989415944.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/funatafokij.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076eecf85f97---xejufofajetapix.pdfIn PDF document text
    • https://p87.hu/files/fujemubu.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/1853268123.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/84c2e0833d91c56e1a86555a4f1f7ae7/bakusuwimikovudopezekir.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b00c44f502---83376614754.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/bulobisanenivakapexemudub.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210629_28D8649A11C057A4.pdfIn PDF document text
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/xalogokuxevijitigirutaram.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741e5e72738---kitobora.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/wojolo.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/326978cbd6550cfa4c8efe5e04eef8fe/85443777909.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+put+music+on+discord+botPDF link annotation
    • 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_off000111b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B8 18172 bytes
SHA-256: 8037671be00abfabc988ad8a4037d5c792ec43fa5d79871a0738d13af4a5d394
font_01_sfnt_off00014214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14214 10652 bytes
SHA-256: 6f86769fa1333d3c9c6e636e8a06de93f9f8ca70e2a7393168b4b7993d034c3b
font_02_sfnt_off00015a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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