Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6464320701fbf1…

MALICIOUS

PDF

71.2 KB Created: 2021-09-12 04:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 332b5348988199c1499a9179d795d54a SHA-1: 1af557311ac3cf3dc593a73f0e3eebad7bfb56b1 SHA-256: 3a6464320701fbf12508339c6b9b2bebe56645d242862e5091122ef95e7c2300
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains. This pattern is commonly used to distribute phishing content or redirect users to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=tab+s6+lite+as+second+monitor PDF link annotation
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/95961604354.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/lusobonuwumo.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/92f2d41b9015ce1c356cf0cf3b8e5010/18711934677.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161346db0e50bc---41512027564.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14674435335.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/34056866600.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/tepemotusimuzememoxegonad.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c85bd858a---12523950807.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/85309804821.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360e763eeae---49301690840.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d018870f1f---67871888019.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/54747366451.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/73870369027.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/babemopazinupejujefixep.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/nufovoxenetitipox.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109110846089494.pdfIn PDF document text
    • https://funke.be/data/file/gowopigosifivekenaba.pdfIn PDF document text
    • http://workontext.ru/media/file/rasiloro.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/47444379937.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ca4ccaf05---41295099453.pdfIn PDF document text
    • https://ivanamihic.com/files/17467446694.pdfIn PDF document text
    • http://faradbox.pl/files/file/tozemuruxozonadebid.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/wogafejuzolazixo.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/kanebozerobafaji.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_off0000b63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63A 15552 bytes
SHA-256: dc544794293b0fec33a2b422fbc7f45fee31f23090bcc33e5b8585ec2598a8a7
font_01_sfnt_off0000de28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63F 10800 bytes
SHA-256: edf5f8961f67b98f738f4db889ef5ec01ddb9352edaef8a8f15a47e6d48097cb

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