Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f1cfb1d5dd8474…

MALICIOUS

PDF

62.5 KB Created: 2021-06-18 00:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 02505921dca8095fe6677af5b925db5d SHA-1: 24c6274c566ba4551eb55475527e687a3cafecbc SHA-256: 90f1cfb1d5dd847456c68c9a01d58a70d9de911b61f86c2296541dc5ecf9ea2d
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 5

  • 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
  • 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://huntic.ru/uplcv?utm_term=all+documents+reader+apk+free+download PDF link annotation
    • https://vestol.bg/files/file/67035246082.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089c1b99ac11---72774738966.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0977862173---remuduxipivanel.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/67766244724.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/70018673462.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/momar.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/domuxasosiro.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/c53536169bc29f233d68c5d1434d2853/kapujajozisi.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/480eb54831a492d7b813deef4f387c08/famitebezaxulolanuw.pdfIn PDF document text
    • https://vestol.bg/files/file/bikusilum.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82b1cc494e---tegarejosubivivawumedow.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b107ae25e39---vexetaretonedon.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/zizaxebijaxu.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c06f39f996---sekukumepafes.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/bhl0ks2df2ub8cbkmnjheosnbd/4043422541.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1026b2137d72119c2571203ee454da14/62789469459.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AB 5444 bytes
SHA-256: de4a8cccc5acff94d542fbbca206f8e235cccd5d85e66955c4d1eee12eddeaf4
font_01_sfnt_off0000f426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 2252 bytes
SHA-256: 7accecb880c2b0fed565a62c5cae8b27c20057ab4a355afeda0aeb37332f7926

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