Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e89b6c9d2f974fa…

MALICIOUS

PDF

88.6 KB Created: 2021-06-30 08:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3330ccb99fc3a4bd21016db6215a150f SHA-1: 19ef401c8bf191b9c57aeadfd4e4c48843d8ec8d SHA-256: 6e89b6c9d2f974fad040a5209cd651f2f33b5fcc1f3cd4344efea33efdbaf5fa
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites acting as hosting for other PDFs. The ML classifier strongly indicates maliciousness, and the link farm structure suggests an attempt to distribute malicious content or phish users. The presence of external URIs and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/12882916495.pdf In PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092127bd5401---mazolunotasokiwotixibolaf.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/2950r9oo3m0e3dcvd5fu6854qa/kakufululoli.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/lelasetividok.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/80992d2663c49cc5b33b357aa7df772f/98493296692.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/10771248863.pdfIn PDF document text
    • https://rosycaffe.com/file/dibez.pdfIn PDF document text
    • http://4bx.pl/public/file/wepexofoguza.pdfIn PDF document text
    • https://t2sc.me/userfiles/goliwit.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/davoxalopuvisumisegadiz.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/jadokupikagenajabidu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16f39b2141---kabojize.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a699c36e14b---65639997242.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/tazulib.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/31eb46bdcb680e29a28c7933053a60da/21803464908.pdfIn PDF document text
    • http://staropolski.net/Upload/file/romigadarixawakagiguti.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16097aae5867e5---45080858915.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/13867593030.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608117375a8ea---vetugalikot.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/9pm4k5s74t6mqu73dldf1u3me5/11492018287.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070c052b9f5b---futalodu.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/gajosivatibiwajabawev.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0b295450d93913e90ced6dd9d5938f1/58916904533.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/dugesixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=at+last+i+to+do+all+my+homeworkPDF link annotation
    • 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_off0000f5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 17336 bytes
SHA-256: 69b5f4c532c8f13c7409ec8f1753014622926b41daa07d6d7a07f257ded6b26b
font_01_sfnt_off000122dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DC 10680 bytes
SHA-256: 0ac0d70f9596acf825a12ba2f3d26ed58922c8cdd81af0adc175379bbf7a8f76
font_02_sfnt_off00013b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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