Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac878ae6a1745122…

MALICIOUS

PDF

94.9 KB Created: 2021-08-07 13:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 94e38216b65725b3bfa0e0e4027019af SHA-1: f2dc11b7eaab7b7e725ba26f3a2bb0609ad98bcf SHA-256: ac878ae6a1745122c899b97c5c1edd938ff12e105de54fe4f22dae213c6570a2
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://federalwayhighschoolclassof1970.com/clients/8/8c/8ce2019516a67423f07d8eefa67dd611/File/98881615951.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9899542ae790619fef81e1329b57f5b3/mamipapijowota.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/95310815006.pdfIn PDF document text
    • http://usmleworkout.com/files/file/runibumugi.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad68956ed92---lilenipoxivuzivibob.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/33595456807.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f50e522ea---kuwegavi.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/96190477449.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/teluzevifewofejo.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609690ae4b52b---lunasibagiguto.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/zugodemowalopalulove.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608078ad2540a---figegolosev.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/83136914640.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607611ee147cc---jazowuke.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160aafb7c06884---wibefapamat.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/aeffa053e86a84883c7ac0888e247a39/50956479194.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/79086971897.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/4198ddd0ea3b2f09014f6b989511f5c0/68266989113.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/pavowevunibazusuzegup.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/moken.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/11591961501.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/losunikewovududi.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/jubowidumabinowejulinas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=5+oraciones+con+when+y+while+en+ingl%C3%A9s+y+espa%C3%B1olPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF267 18480 bytes
SHA-256: e70baa9d994cd3705bb2c2dae5780945007974b45b1ba41f35c8d4aafb992af3
font_01_sfnt_off00012195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12195 16632 bytes
SHA-256: 680e586a1ee573e661d30ea0f7a97a8805d5b79b2e3d5282e6cd27ea8e1e9edb
font_02_sfnt_off000138aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000150c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C1 11152 bytes
SHA-256: c3b7c3d5d66fade5cedca426a446cacdf1c8b4542a8abc2461a557482890968f

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