Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aade0ddc1e8ca8a…

MALICIOUS

PDF

83.5 KB Created: 2021-06-10 20:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe1832a3742b3e638199896b53850be7 SHA-1: 1a15c1cf544f4c7e41889066ed9093ee243f7250 SHA-256: 8aade0ddc1e8ca8add4f110f9fd5757430a457ae0251cce71e883fb0011a0834
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=free+survival+battleground+fire
    • http://backupcenters.com/userfiles/file/54257603225.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16094b0f05c492---niroguxuzadipag.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/1ltus83gvemubr6t5pii4gr9sm/37989492126.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080d79cb20c3---gajakexusaropibemi.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080e17759379---28886999071.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160708c70a4a4b---40723865072.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607379593c80e---8871780354.pdf
    • http://austria-ex.com/images/blog//file/puwikidoja.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160805d6d6f4d0---34457146532.pdf
    • https://barcelonacentremedic.cat/files/galeria/files/jiranisulekepojo.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee28a9391---fukinogewopagosonitola.pdf
    • http://zovsh.com/Uploadfiles/files/xewokipujorakukus.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/li7ithjt740t8a00hjghm3dap2/50276622362.pdf
    • https://invest.pl/userfiles/file/4463003873.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b0f328cc2aae88241bed796a24ac476c/nexefiramoruposinogipov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e689.bin
c85299843dc5ab87ce9440de0ef9885e3af8e90eb1bfe960cd247c56964a84a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE689 5112 bytes
font_01_sfnt_off0000f7f8.bin
af02b1c5d2ca8361f210a5feddcc93f12056d8ff53c851846c9e3c1e97872f67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F8 1956 bytes
font_02_sfnt_off00010160.bin
9e552d8c1f15ebf4f50cc39e382af2b5c7b3a8763b54a5e73f01e982693d56f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10160 20072 bytes
font_03_sfnt_off000132a2.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132A2 4324 bytes

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