Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5b861aff148f9b…

MALICIOUS

PDF

229.2 KB Created: 2021-06-23 01:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b48f3434e5899c7f7e6ed04bcc754458 SHA-1: c04c14448df32de8703d1c7525df29f38a1377b0 SHA-256: 9e5b861aff148f9b98cc7e9603b679cbbb4b4a0b6dfb99939df4c43e99565e78
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or credential harvesting attempt. The primary malicious URL identified is https://drafthe.ru/uplcv?utm_term=bs+en+60439+pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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://drafthe.ru/uplcv?utm_term=bs+en+60439+pdf PDF link annotation
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/le7is32bmduvriqvo569mdo54a/28036023712.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607570286fbf7---35162096040.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/84401720775.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/62916237989.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/87cc24effb748e6e81eb21175d42bbcc/karigilusamojulipo.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/2s8fb4rvjjkk8t57ng9umflpr7/gelages.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c25cf29156---34557450534.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/07d2c9926ca7c5d4b6476bc8c0eb5b83/zemive.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/27726901764.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec9432d706---kopiviwobaliwufadami.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085342e3e693---58378521482.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/78940607001.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/92508316937.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607843a61c9b8---54937461378.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/b0016810b02b4fec05f13576f2f42bdd/tinapiwisomuvagezajud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003346c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3346C 5000 bytes
SHA-256: 2ccd01e20c45d4dd1d1192a821e300aecb4afb81560efd64ff6cd8daf3433061
font_01_sfnt_off00034566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34566 27948 bytes
SHA-256: 138e9f6ea26db18d97751e76dc80738f3fb81530ead27ebe21ad8851d0058fba
font_02_sfnt_off0003806f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3806F 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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