Malicious PDF — malware analysis report

Static analysis result for SHA-256 7251b911be65ede0…

MALICIOUS

PDF

95.2 KB Created: 2021-07-14 00:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c549743b9b7d42bdb12b5ac9192eab2d SHA-1: 498745f19a317de6c272536f3c0b33725ec6f45a SHA-256: 7251b911be65ede08c26c248053e268863887baf71415c48f3714cfe1fceea73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or malware distribution intent. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure points towards a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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
  • 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://infrive.ru/uplcv?utm_term=lost+first+love PDF link annotation
    • https://charlesstreetvideo.com/userfiles/file/15008064299.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/gajoj.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/m0lsqh1p69ak1mtmu1ktcf1vo7/3100935639.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b94e63badaf---bavesigimatojex.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/jitukudiwonamamalem.pdfIn PDF document text
    • https://emmaushuis.org/pages/49510169098.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/6342064113.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160d1adb1f2b6e---6255993278.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/80320169324.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/8e66690d29024e853dfc1365356e02a0/52903643892.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/xamamegimanabuwe.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/00faf1b5fc5e906a66cfa0de1d381f38/lezanakafirebofixebarogug.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/839f6f882fa263671bc68e24e76c44b0/fokasos.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8c8a1ec8e---87695702837.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d24d0ca99ac---riligafisedixafot.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/162c16ca3f16474559eae14539aa7571/nufofo.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55bbdc6d30---58253976655.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/7cebeb4fdd92c23fd253ac818ca07fda/17293597774.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/72702330468.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/57514844989.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/venonafokabebazogi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s23e0m8tfcl3lq87pjcftbs3v4/76213789297.pdfIn PDF document text
    • http://espokebar.com/uploads/files/mujutidujafojefe.pdfIn PDF document text
    • 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_off0001136c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136C 17244 bytes
SHA-256: f5afbf84c01a3d5e58c3bd4db1908a51f1e9bee041a74d2db0d592193b62b972
font_01_sfnt_off00014017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14017 9964 bytes
SHA-256: e2034d6cca8a2fb4870ff18119e2eba6c1bcbefb1be2e5f8f142eb625c0c480e
font_02_sfnt_off0001564f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1564F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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