Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d655b2d1e958c3c…

MALICIOUS

PDF

93.5 KB Created: 2021-08-05 06:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a2004d06bcfdc7d3b86bd6d8386ef639 SHA-1: aac9d0dc8b8ee10c8200c014fb2704ddac7c1390 SHA-256: 6d655b2d1e958c3c193b4e5bde402668823888dde3dc756a71efb83ee5869d85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is structured as a link farm, with many links pointing to compromised WordPress installations or disposable hosting. This suggests the document's primary purpose is to redirect users to potentially malicious websites, likely for phishing or to download further malware. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=karz+mp3+song+download+mr+jatt PDF link annotation
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/7uq56l1tq5mb68gdduhe6rlvur/88821905237.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607daf5e86b12---2787941870.pdfIn PDF document text
    • https://geniodelweb.com/file/mepisenafogudan.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/kfb4qhpbkj8bviolo0lusbkm65/jafudigabori.pdfIn PDF document text
    • http://schokozentrale.de/idata/veduxepalo.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a5e4e6a6e---17719407394.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/mimiwuzepez.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/f73544d615b25143af1e8b12fd5ca619/kuramisiselewebolu.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/xitojar.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/34q3pcp2o3m9rp7t58bque3sp2/dedukoxerolavolelawejar.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608772d5b4ecd---dekobaregaxigon.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/p6gfhman06ok9ekecqt6tus4i7/zofapumar.pdfIn PDF document text
    • http://jacksonreunion.org/clients/71346/File/mejojosemuduwinumuti.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16075bbfdb5fb4---gozubibireg.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/ribexejodozixepo.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/34715774379.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/71114546116.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075222aa2e6f---79532534256.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d1f85e5b3---33836536976.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/3hd8dp1lrhnugc4sti13deieqs/tafazoteder.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0b7a4e41cecc0a480b373c99c3ac119e/zatesisezobezobufafom.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608034127e6a9---puxegagolu.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/v7skd91h6vs8q3a1vj5b9d8g4t/rinuxajojuti.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 16760 bytes
SHA-256: 9fe404c742b6a13a9b2ae5b1ea2a80c956c7e0c3cc6209102dad94821568a92a
font_01_sfnt_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 17360 bytes
SHA-256: 23592d25de41168158cb12918b5aa9c413ba1f3f024c82a397c6aec0ac0b4218
font_02_sfnt_off00013681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13681 10952 bytes
SHA-256: d0a6169d1e6aca98ceb11198976e98737aff5c04123f9723e3c3128c4fba9913
font_03_sfnt_off00014fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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