Malicious PDF — malware analysis report

Static analysis result for SHA-256 245f01b662a8876b…

MALICIOUS

PDF

74.2 KB Created: 2021-09-16 10:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e4b41409f3502c51b59ce550e167b23b SHA-1: ff54dcfe1b15addb9a36677cb90a9662be752f1c SHA-256: 245f01b662a8876bcbffcea6db6a595c86fc09e2f76aeaf89edaf134771d7898
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 storage or are part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://infrive.ru/uplcv?utm_term=new+bollywood+movies+mp3 PDF link annotation
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137936b7c171---vorojilobizovapesab.pdfIn PDF document text
    • https://wittnebel.dk/file/manetora.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/kasikufakofepeko.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/22807528465.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/perinamun.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/bupeta.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/damojekupopedulevaj.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/3073288499.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/xomawobugiwa.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/xawotenifidup.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/lewik.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/48498631753.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161386d88ecaeb---gigonijev.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402d56da8dd---61645754740.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/fujaduvuvajo.pdfIn PDF document text
    • https://rcot.org/userfiles/file/43220282906.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/zejogubejiruririz.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/44233172852.pdfIn PDF document text
    • https://kapefashion.com/files/files/rokakakipexukojerapu.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/74850946162.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/tifijewum.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/39142203203.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/a2b31a4c1b54dc692e04a2a2d7847a0d/xonesibuge.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/kegaxu.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/22447907058.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210916091639.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/32502442744.pdfIn PDF document text
    • 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_off0000be7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7B 17244 bytes
SHA-256: 9cdaf891df99e62407543881cd4f7272bb217d225e315cdfbdaec98cb0e7d512
font_01_sfnt_off0000eaed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAED 10644 bytes
SHA-256: 0ce1554557386181c55652326bd5e00366092234a5497aada0fc2a5bfa679b23
font_02_sfnt_off0001032a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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