Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee21468aac44b59d…

MALICIOUS

PDF

73.9 KB Created: 2021-06-25 06:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 33a952d11118ee0629f751dbf9052a1d SHA-1: b15aa3f262df41fa9c307a7a5b05652b3cf5fff8 SHA-256: ee21468aac44b59d841e02771530e415f7d54ed9935ff6aaccc60696b6d2b990
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://queure.ru/uplcv?utm_term=emperor+mage+pdf PDF link annotation
    • http://csc0512.com/userfiles/file/20210612144807_bp2rv2.pdfIn PDF document text
    • http://ridendo.cz/files/file/bexitevapopixadukadi.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/df54a9af57eca909a8e26cba2e0eac41/33657105228.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e9bdd14ac---72470642055.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/39832948686.pdfIn PDF document text
    • https://mmszke.hu/files/file/dinotapusapoxufefixid.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210611185638.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b59c4cba0ae---sinimajagagaz.pdfIn PDF document text
    • http://robbes.nl/media/files/19599159401.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/kaniwebu.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a152d5eddd6---78039017163.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160afaa7cbb0ab---34835007544.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/62607910124.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/80506b7ce1a5c690008baa52d41d9942/18525364951.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa13b6e7fa---kozikelasevesetopeka.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/nuzaboj.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210607093413_axe1am.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/84284031049.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 5108 bytes
SHA-256: 2944ab1749a61f74c7156885ccdf78dcdc50f94840afd1899e6306143d1d27b0
font_01_sfnt_off0000f46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 10964 bytes
SHA-256: 979e069f433e0154443543486ddd3224e66127e1c2f3497f026f3da8e06dea5c

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