Malicious PDF — malware analysis report

Static analysis result for SHA-256 968de366a3fb0dfa…

MALICIOUS

PDF

89.2 KB Created: 2021-06-28 01:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e8d59d81be9c3c8b5918d4b762ddc483 SHA-1: 56059b19317f0ba123702b1bfd221794205c32a6 SHA-256: 968de366a3fb0dfa518b6b4d03ce7b26e2e1bef9e3b944a8954739ed76675a61
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous external URLs hosted on compromised or disposable domains. These links are likely used to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=famous+people+from+butler+pa PDF link annotation
    • http://soldearenales.com/galeria/files/pesoxe.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/0eece0551da99e74be8399ed8daf29f3/46659031685.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/38161152779.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/32375042857.pdfIn PDF document text
    • http://hydrem.ru/images/file/nomuranewu.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/26c7d89e944bc66aed7675826592b9f2/jekegibakexonunuxin.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969e83b6995---fifirejogekega.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/vokelinir.pdfIn PDF document text
    • http://proxima-design.cz/files/file/69404928581.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adb99abd091---larabazitinonudekararexo.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a117682f062---15967787572.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/1523162924.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/74310355985.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/sisukub.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3fb1007ed---fumovafinuju.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748e09aaffa---zojoroxoloki.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/2d950f583860c48575b7b41735ca3d46/48122549883.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c693619783a---wofosamovo.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/97971940815.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/6dc0ccc14a7d81e051e5d9ab1c17a58c/2662649258.pdfIn PDF document text
    • https://melz-feu.ru/upload/pazimox.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/l4ir2e87oret8f5pcq6sb2s63k/85144761718.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/6bcc127c7d410f092feda37565d6d217/sokarid.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/zaviwimifobo.pdfIn PDF document text
    • http://files.usgwarchives.net/pa/delawareIn 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_off0000fc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 16808 bytes
SHA-256: 15cbdf4ac4e27a76a0773ca9fcc5fba1a4618978f325abd6785af419e2aab87d
font_01_sfnt_off000127ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AC 10540 bytes
SHA-256: 6a347c77d53ae62961472f207c51908e8dff2d3e2f1596211cfa3a2c6cef59ba
font_02_sfnt_off00013f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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