Malicious PDF — malware analysis report

Static analysis result for SHA-256 728fe8f6b114be05…

MALICIOUS

PDF

82.1 KB Created: 2021-09-13 18:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7059f820463f70c8e0c57958d68bbd44 SHA-1: 8fcb2be76b91802a0832b0c120b665a646782624 SHA-256: 728fe8f6b114be05e12e17e59d30e486052f17be702b8166c545f22f5bf3eb62
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised CMS uploads, including a PDF hosted on a compromised WordPress site. The presence of multiple external URIs and a high ML classifier score indicate malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this, suggesting the document is designed to trick users into downloading malware, likely disguised as a utility.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cosplay-expo.it/ckfinder/userfiles/files/fepibajulekirorixe.pdf In PDF document text
    • http://jpind.pl/userfiles/file/babenaxivixami.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/f5b4010ca40b6673307d47c5f77c78ee/povepa.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/35663481947.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/2e1b8bc44c5fb756ef7d0f80432d6e7b/jemebedupuzawawaxojoduwoj.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381054de55b---4140468931.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/47501403272.pdfIn PDF document text
    • https://somogyplusz.hu/files/dudujuderubawatemotuju.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/nezumi.pdfIn PDF document text
    • http://uteambio.com/upload/files/14662286694.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/duzapazijotugi.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/tanepon.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/95407019186.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed8af61e63---voxiwu.pdfIn PDF document text
    • http://cortabellanews.com/userimages/38699366855.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/35594848532.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/d2407d2bc7abd45de037ff5b4b4ed959/lukejivuxebovonatej.pdfIn PDF document text
    • http://ccshecea.org/upload/files/18483707676.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd5359fd07---12107376277.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/55860057943.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/65270801898.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/mejerowaxopadizanukupib.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/saxitabokas.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/tezatoludomokeper.pdfIn PDF document text
    • https://granitnet.hu/editor_up/bowatevalezolodezirepam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=download+wifi+qr+code+scanner+for+pcPDF 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_off0000dbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 10748 bytes
SHA-256: b7041dc69f2006cd63fbf9b83b0102fc64d4507fa5bde41beed2c7c84126317e
font_01_sfnt_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 17520 bytes
SHA-256: fb29141974b47343ebc96263a48bec537b84a41433c5aa3db9b85ea5fc5210f1
font_02_sfnt_off00012229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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