Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4c8acfa0b052b6…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 17:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b6fcb87372918c62829818d6f3a60daa SHA-1: 4aacf8e30ac241e09c31e8945bb6a2de7a869cb8 SHA-256: 2f4c8acfa0b052b61fea73354a34aa6abfac62d39a21535ab934b5c9f781dc84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://movie2book.com/userfiles/file/busitarufisa.pdf In PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/86097532423.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/95851357127.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/danibujusokerenopo.pdfIn PDF document text
    • http://tayles.com/uploaded/24980814434.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/busuluvapin.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/59913241003.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/47584860945.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/56214970243.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/jodokijuburunewumuxeb.pdfIn PDF document text
    • http://haki.vn/uploads/files/81266588334.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142c4a9c0514---26234069752.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/15dd07508460a6ff4379704271823abb/48264872792.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/27287627532.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/5097300674.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/90486003956.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/bedomobu.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/37136deb839d58bb90b0ee009be13158/6990590651.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f7e7c4e1f---74368938538.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/xuwagizepokira.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/belaz.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/96393238229.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/67829170743.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/74432334281.pdfIn PDF document text
    • http://519pf.com/userfiles/files/jagijunodanujotonakimuka.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/bininunizexitokeroke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=fs+14+full+hack+game+downloadPDF 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_off0000dec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC0 11020 bytes
SHA-256: 90de090801818cb1d805e78874fe6f3d6845bafb4add67506ef113618f7dc086
font_01_sfnt_off0000f821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF821 17740 bytes
SHA-256: b0caa4b6ae405d50dd0a966bfd027717109523ae7065219a675fd15f41405ab7
font_02_sfnt_off000125be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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