Malicious PDF — malware analysis report

Static analysis result for SHA-256 24afd6009512a557…

MALICIOUS

PDF

77.6 KB Created: 2021-09-08 05:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5fe5f942984bdbf9025d9c6a7f9d5c81 SHA-1: 51a5062cee2df761699b3ac89df00f5e52830feb SHA-256: 24afd6009512a557f58a78aee81234493d1ab1f5f9b789929de379687d0adbc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and the presence of 'utm_term' parameters suggests a phishing or SEO manipulation tactic. While no scripts were explicitly extracted, the nature of the URLs and the detection as a phishing trojan strongly indicate an attempt to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=purchase+decision+scale+pdf PDF link annotation
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/78691ff9429b3324d517bd1d6f87e505/63043470128.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/1ps3oqs65tetolefp33h431ni2/14049580114.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/zekifazevuzukado.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-2/20210502235151589042.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/48939894417.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9d609412f---xagufoxusanika.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/ruseloxokugabarusapo.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/9c0a8013b99782b83a88c6028410e18c/27944997104.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5de0706e1---5935349321.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160948a7381c4a---49765047341.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/ruvezu.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/bozegukesededipujali.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///7192648255.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/nobuxulipugoxomeleguvejo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612b550b4f611---xerigekelipujewo.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/070a7e7c4dfd79a2b7b98d85152f38d1/paruzinolavo.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/lizifunuzabuluvezopi.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/xonavuratokujuwipizeza.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/80150657378.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/lulimafinasisuloxanugil.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/sqqqr7eadmepaqirohvamipgvf/mumozimizirivodopanijavas.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/qt50tuhkusu37vubtsphqgq2j2/rojarurejek.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac809d0b2b2---79273614147.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_off0000ce1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1A 16596 bytes
SHA-256: 860fbd8e78b60b8bd191ba2b4cc614eca2761b3139d58732ce4020ce138289ed
font_01_sfnt_off0000f87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11093 10720 bytes
SHA-256: bb8aeaf5dee16937b4d2906da8ab1ccb4ab6a7af72b1bf83a95e7384fc9a7adc

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