Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a9d521052d9160e…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 14:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df89d1aa3139c1babcedc87a98863f89 SHA-1: 61586867f041c930dca0d7f186989458d53f1ef8 SHA-256: 2a9d521052d9160ebc7543f413a074bd4d62e1fb86b574d5ed6c47116e063cba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to external websites, many of which appear to be compromised or disposable hosting. The presence of these links suggests the document is designed to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://medvor.ru/uplcv?utm_term=bunny+vpn+apk+free+download PDF link annotation
    • http://capthepcongtrinh.com/uploads/news/files/76859565493.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/jotonixisewe.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/kowamap.pdfIn PDF document text
    • http://cbstav.cz/file/moxuvedinuvizajap.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/78753022416.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/12112798583.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/dijowoguvev.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/tujoniwabijisixelutig.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e5ce1022f3f72850881af653e1edfef9/dunitopenenebulabo.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/79179017647.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/saguwutufisumexalegemuk.pdfIn PDF document text
    • https://wrd13.com/force/file/xikibulizakuzatujebovomup.pdfIn PDF document text
    • http://hiniceshine.com/upload/femebided.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434ebdaabe9---lulakerexalog.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/58813840338.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/xerovef.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/6fb3756f31688cc0adef1b59163e833b/dozimezef.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/gizetezolajatabepivaso.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/xivitikobubozobopegapaxi.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/51638878748.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/fepesuvinitikulup.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_off0000d547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD547 17008 bytes
SHA-256: 6cfc626710f005d51832ae06d5e18c8c3a952f878a877e5203ee396c3e2aaaf8
font_01_sfnt_off00010139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10139 10644 bytes
SHA-256: 356d22e40f43137fdf18a98275c9390732feaa9df7dc0619dcfd9c808799bde9
font_02_sfnt_off000119d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1