Malicious PDF — malware analysis report

Static analysis result for SHA-256 a976861e00c15e7e…

MALICIOUS

PDF

73.7 KB Created: 2021-07-28 04:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ec3fe6752abfb377df45a6d7fb6009d5 SHA-1: a8d2de31f2f770d9c6034f25f5b8e012f79ddd07 SHA-256: a976861e00c15e7e36813d73ddd7e01ec4634bac821286c3a90400a844cff905
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://amursvoidom.ru/media/files/71171928596.pdf In PDF document text
    • http://rgn2u.com/userfiles/files/83863045193.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d49ae213---pagunedoza.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d35d55864f---28957105001.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/noxinumotukotifirirepup.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/pajodutobanidoripezut.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/63e5141ab95be3ce7959f354eb2909a5/raviporivuvogekuj.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/js48b2dab8835e00rnkstushb3/6742189982.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/1212218289.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/99952994438.pdfIn PDF document text
    • https://clove7.com/userfiles/file/nipuvufadokubilubum.pdfIn PDF document text
    • http://pjteam.hu/uploads/93170207688.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/16083032013.pdfIn PDF document text
    • http://altinay-law.com/images/file/75757415333.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/fbb95d8fd4918c8ea1cc4013356efcb6/10416490048.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/wegaluwetubejepusuzazofad.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/jokapemorajubumod.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/jasepisapodenoko.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/bojedes.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/28051168640.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d6de4848c---ledaxomowanajituvup.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/9b3c0db13a5a88b389eaad125520b01f/9042354005.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/norikavelomarabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=envision+math+2.0+grade+3+volume+1+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_off0000bac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC2 11624 bytes
SHA-256: 3c971f5a09fc67a4a6ba6aa74ca7d4a18c59049169fbf78bda59a3b7f027d00b
font_01_sfnt_off0000d61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 16364 bytes
SHA-256: 721fac643b8991b34adf3e8606cd076e1adeb88f3f14ee6daa4240751fd07913

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