Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3606c41445f6d37…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 07:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7d04a5f4f380c9406e091832fe066309 SHA-1: 0967f74df35b84256be4fb4d016335939b32a0c2 SHA-256: a3606c41445f6d3773cb2878c92b1df7c785fb8acea2a3314d72ff50e33c1043
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a large number of external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://crysiq.ru/uplcv?utm_term=a+serbian+film+full+movie+online PDF link annotation
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/gitalejudofezubokexedakom.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/65046618274.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/00pooijka9gq5n0vht3ictqrnq/nejapiwikejepina.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/gabalaguvepevod.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/zuvebegunofomepeji.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/75744689401.pdfIn PDF document text
    • https://aleemanschools.org/userfiles/file/sevoxu.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/18006980415.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161411c90e5580---88458299511.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/1105292329.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/91342620805.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/kesusazipa.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/49662269231.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/pimajusefuguxeduvu.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/lefifojomagofajur.pdfIn PDF document text
    • http://attlas.center/userfiles/file/20854622732.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16143b6a81f715---66388794244.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109161607055999.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161417c898964f---xozosu.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/95934884126.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/96031784477.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_off0000b19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19F 17084 bytes
SHA-256: 123a52dfd5783b77d4871f10c1a593b83fd221d389b64a8bac001a3efa4392d1
font_01_sfnt_off0000dd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD12 10564 bytes
SHA-256: 80c86569ce1acdb8a442691c57722ee16f6af7b689bdb7c338e9a78fd38051f5
font_02_sfnt_off0000f52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1