Malicious PDF — malware analysis report

Static analysis result for SHA-256 e138ea7276112034…

MALICIOUS

PDF

70.7 KB Created: 2021-09-03 21:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 12a5acb33fd502aeec3f62aeb151b652 SHA-1: ad403ba707d9a57b6156f9e7ca4460cb8d131fd5 SHA-256: e138ea7276112034c56b0d9d3fa46269a8964d7d730fa6a83dc6d462e7898e9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links are indicative of a phishing campaign, likely using Spearphishing Attachment as the initial access vector. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://thediamangroup.com/_images/files/xejezoremidaduzupipevu.pdf In PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/foxetidex.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/66128885879.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfe6373fac---xitosewofelififekowi.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072efd9ac199---77533249145.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210714_114641.pdfIn PDF document text
    • https://reinigungsfee007.de/wp-content/plugins/super-forms/uploads/php/files/e5iespdmnm6pg3ik01veq0blfv/biwoxake.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/1v0u3ei44ckngmmubjl409r6bk/lobosenumo.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16090f68024c78---75146293840.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/18888336462.pdfIn PDF document text
    • http://traviet36.com/upload/files/moragixelapezuremopo.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090c681b0c58---87877250649.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/16a0408482d2035b76ceaa111c6e913c/6679058636.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/e452857939873eb5f040aeac2ade7345/34699251941.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be02abc73c2---jotonujiburovevutezowem.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/berev.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/932987011.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/vatofikisuluj.pdfIn PDF document text
    • https://bachson.net/upload/file/dozonexip.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/k5ohj7qv2n42tjljbqtrru6a92/83159258226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=startup+construction+business+plan+sample+pdfPDF 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_off0000b487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB487 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC99 15232 bytes
SHA-256: 6b907c97e1b460176219727d96985ebc622cc6dddde74f3b5ffb74b7cbe60796
font_02_sfnt_off0000f30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30B 11096 bytes
SHA-256: 55cea70f15ed326fae7b2bb40be1d0d03e179b9c60ee102206c2d32736b31f1e

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