Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae4a1ad12a63506…

MALICIOUS

PDF

76.6 KB Created: 2021-07-22 16:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2c260a80c38912740ea41b4c4d5cd624 SHA-1: 4b9a06d782f8ba06d41f05500637c2f4d522218e SHA-256: 8ae4a1ad12a6350640e6584e0ba419acde51d6450263fbe9d19e2078450e89c1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://etenindex.nl/images/uploads/49715889194.pdf In PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608785e396e0f---wusubomefotitisanu.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096e878a4ab3---ritodumejevug.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/e0901820db64d5f752345e6c6fd216b9/45850412976.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8f6adc58075b09dbfecb1e5ee8460ac8/witomi.pdfIn PDF document text
    • http://sam-global.info/files/file/11799419151.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/94113799472.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/21/fatikolurolorofatizoxukuz.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/jivazi.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ee42be54187---lonalurikenaf.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/47680782c9183bbd9f2456d21bc1b7d6/83831287609.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a154a12d829---mitugakuwizajodinilore.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d4add5bb9---jifirejakad.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/acc5f057304bc20cf648c3080b3b3382/56976221037.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828c2541887---naxifelekos.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d50f42d3a9---24033533809.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/fofebanimamutudi.pdfIn PDF document text
    • http://thongthien.vn/upload/files/wezajobofalapuvafo.pdfIn PDF document text
    • http://mopron.ru/upload/files/xazog.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/89afe6e8cdbf6aaaf63452c96d24c33c/vezevibutujof.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/mugutiwipekopipejakosate.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e5364962a---299789248.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/aalu37aspoc2a7phcf6ju71efq/wepito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+astral+projection+guidebook+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_off0000c6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C9 11324 bytes
SHA-256: 15f8625e1b6128a0538871a699d5ce00ac8b190f54604029fcf968910a893e4d
font_01_sfnt_off0000e0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E6 16724 bytes
SHA-256: 911e0dded3c8cb3d97daa68fac8f09ed808932fc7e9b6c7eb3932833a2eb745f
font_02_sfnt_off00010c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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