Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c9bb327f7da975e…

MALICIOUS

PDF

88.4 KB Created: 2021-08-07 14:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1da9c196fc20c39728834fa97852bc30 SHA-1: 6b65296212a6b0c635169ad89f91d60c3be7142e SHA-256: 0c9bb327f7da975e5ab9d13d1fe75c377443c01bade1907906d34bdd47572e36
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external URIs, many of which point to compromised WordPress sites hosting other PDF files. This indicates the document is functioning as a link farm, likely intended to lead users to malicious content or further stages of an attack. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://irlanc.ru/uplcv?utm_term=osmosis+lab+report PDF link annotation
    • http://recrute.fr/files/files/kedag.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/9344a1fa05850a4ff5dee24bb894c6b3/teduromaligajowiki.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/288smibjdiqmv1bgvl516mpu7b/67417892262.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afcc1200bea---jigowu.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/gofifajupubuxe.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160923f3b3458a---jowuboguwokuvezuxukof.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/legazuk.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/93558771028.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f6558e928---22419675193.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/20615811949.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/90020433200.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a045e82ed---vinegefefasiwika.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b75b13d232---fuzagotupimozibola.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af89da71055---242609910.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/35325478584.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/xelabedepujitu.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609856705e12f---92384131327.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0ecc03735748b54d883dad4084192a61/83026353727.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lekufifonixot.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/946836116.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/67262977937.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/14bebbda5d11ebde1a2d00e9bbf0dc49/53139543279.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/47909747761.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/vuzaxebupebi.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_off0000f608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF608 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1A 17332 bytes
SHA-256: 3cc3ef7dd3a9bd46228b35e33ab790808018e5fe9374f180ef0c3b16b13ab756
font_02_sfnt_off00013bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB1 10476 bytes
SHA-256: 199c09e7e0b6f9325a2a06a1b5cc0a2bbc396003174ae3ee15e7c53ece36b69a

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