Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b0ed921733c7ce…

MALICIOUS

PDF

117.4 KB Created: 2021-09-07 20:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ecd4614464477da58369e27a7aeaf2cf SHA-1: 584c53710bca5c016249b3389e1da940989758fe SHA-256: 01b0ed921733c7ce2c706233cd651b3da8d4ed3d675bc54395a498d331411169
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the document is part of a link farm pointing to compromised websites, likely serving as a lure for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/4db69f7235c5f7718bdbcc47cb2dd82a/majezapujutojo.pdf In PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16120607d8d6a0---18225999663.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/narovojizafag.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/5vllcmvn5v0sgs2kfss7p29mqm/90816569738.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0e7246208---95325851135.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/7027635186103e09b7ef5c.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/faxivore.pdfIn PDF document text
    • https://kermanrooz.com/img/files/99354157174.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/98747543446.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/5526781214.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/97432047407.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/gojejikikonum.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746df151cb2---40838850850.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/rawafalemidegodejo.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940cf5501fa---14404538986.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119c14422788---41122347977.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/mikurafovura.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/foguwu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160da9d005aebf---36947724161.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a8e9ca5b5---32852770354.pdfIn PDF document text
    • http://wernitznigg.at/files/32040976288.pdfIn PDF document text
    • http://xn----7sbabjkhbzbqti4a3apfmdd2s4b.xn--p1ai/ckfinder/userfiles/files/mimuvazuselasarisujak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=lei+organica+da+saude+8080+90+pdf+atualizadaPDF 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_off0001631c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1631C 18768 bytes
SHA-256: 184fdf54bd6d4a55bf53354f603069abab7a7d318910a9a452aa30eff143dd90
font_01_sfnt_off00019490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001aca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACA7 11412 bytes
SHA-256: 436c8d57ee7bc1eb52624271a63d9f0f15ff2c1f6e09f38a9e192ee1d3f6dea5