Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7f5d9651e76b08…

MALICIOUS

PDF

88.7 KB Created: 2021-08-12 19:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 19b80b9d38d55f35686a71a5b2f289d5 SHA-1: 3eb3e6576c8ce57dcf159c0e1e35c19c982c58e3 SHA-256: ea7f5d9651e76b081e9b5cf22ed56dfa67d75362c018fed1df788b1c63d875db
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 a link farm pointing to multiple compromised websites, specifically targeting WordPress upload directories. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/a2b0e23452a15f133bb93baf926e1b4a/godofuvuwubevare.pdf In PDF document text
    • http://griswoldremgmt.com/uploads/files/gamurapejumi.pdfIn PDF document text
    • http://gospelinamerica.com/clients/874377/File/vepaze.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/60772476996.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/xupajutuzelika.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/86611659261.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/28059230787.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/taturiluvu.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed59d7a0731---75364482632.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/cc25ddf97bf8e2fc3cf424b065594b8d/84546732024.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2106281648309693151vh0hbxj3hxr.pdfIn PDF document text
    • http://charivne.info/images/file/42579460874.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c895ff4996e---17414915549.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607eecf9dbce4---wagifanudewute.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608386d7d43c8---35041879543.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/35777182158.pdfIn PDF document text
    • https://www.roadsafetyrental.com.au/application/third_party/ckfinder/userfiles/files/57767429781.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52429da98b---wimifib.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/xafis.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/51842246269.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/38907544047.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/sulizulenikexafokozukel.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/duwefimobuv.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/sagalewepelatujube.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf00948365b---xogunimiminokubuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+do+you+write+a+deviation+investigation+reportPDF 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_off0000f943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001115a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115A 10880 bytes
SHA-256: 1b848c852083e73a7d405d965f8772e577fd39b6b3ae00fc0dd05e98ed7529e1
font_02_sfnt_off00012a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A77 16228 bytes
SHA-256: b8feab23e5d4499c910a0565aebf0967a17ac55031aeae07df340c094d5f1981

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