Malicious PDF — malware analysis report

Static analysis result for SHA-256 f909af6fac6d9add…

MALICIOUS

PDF

71.5 KB Created: 2021-09-16 14:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 68cb7040f33fa2ee45ee71d7656f651c SHA-1: c84597a87e5b364f1ec7220895d555058559cb6f SHA-256: f909af6fac6d9adde224051781c13b7f1f356b4aa5bf8a6502e0ec8eba564825
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress upload directories. This suggests the document is part of a phishing or spam campaign designed to redirect users to malicious sites. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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 https://ketchas.ru/uplcv?utm_term=how+do+i+watch+my+phone+on+tv PDF link annotation
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec19cd9268---mudinesoridifof.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/foxugol.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/09fbbac8f57cfa8211260cdd1b253b8e/xubaxezoxejefufukamokaral.pdfIn PDF document text
    • https://soechi.net/userfiles/file/76154861223.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/mejufudug.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161386469e76d8---36560606071.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/99303846359.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/72510097586.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/nonilotowepexuf.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/vosolokol.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/2758592904.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/mn21ue3hq93h0pf3eb5afe94hp/48614876009.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/88234858934.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/40189345918.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/lilafesoz.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/6374122340.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/37901159142.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/20670545058.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/37582072907.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/sodiz.pdfIn PDF document text
    • https://mashura.co/userfiles/files/15356127939.pdfIn PDF document text
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/tewovusup.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_off0000b664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB664 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7B 10720 bytes
SHA-256: 227d5171903faaf225c4c749a8aa6e61a19e830395de31927fd06a2c5dd86aed
font_02_sfnt_off0000e6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EC 16176 bytes
SHA-256: 607a19489926fc0206adf17bef25c6236dafc11e25934545f42b6735f3b94865