Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d72f329b3df331…

MALICIOUS

PDF

102.8 KB Created: 2021-10-06 18:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 07c2e2394f599a45ed9cea375f8a020c SHA-1: b45d804eb8b86d1c221be2b34f068c381cfd9ba5 SHA-256: d1d72f329b3df3314b0e46d0333ce04a630ac019a4338f657eafe1ec22b04458
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://www.oalysa.cz/ckfinder/userfiles/files/22820870865.pdf In PDF document text
    • https://trieurodata.ro/images/file/zudivezemaxajevonuxo.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16153fe06c4ce4---rimode.pdfIn PDF document text
    • https://lordoptika.hu/files/files/49030636029.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/zodabibinigavaxavaka.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/wunavanoxapudemozisa.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/vle7tv54f05b5ne41dgbr2j0v1/20853710687.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/puwumoladosomiwedikaw.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/57849620093.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/kuzerer.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cff24a35c---fakozotubatalapefevole.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/63493863113.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/vovosawotomutirimawitusip.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/20357263710.pdfIn PDF document text
    • https://drgcode.managenet.ro/images/file/20247687325.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/weporabo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1615b7bc03374b---wekutivupejijileligalelu.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/bofabefikug.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/1324682412.pdfIn PDF document text
    • http://allycatering.com/userfiles/fonadofol.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/visasowunoderipexabogujow.pdfIn PDF document text
    • http://agavietnam.com/img/files/sataro.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161568ed521c63---33987220108.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/28839429100.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/naxexedivijidagefunotarow.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/pupigikubix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=12+hour+and+24+hour+clockPDF 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_off000124f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F9 10320 bytes
SHA-256: b730ff37b4b84f8f78a1ea340b8f2f3cc5f5cf440d8005ae82f2b2260642d69b
font_01_sfnt_off00013c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3D 22004 bytes
SHA-256: b8ffb52040c3adcc4f69f9e4861fe6a43bc1c57c9e152a498fa2a28462e04cd8
font_02_sfnt_off00017515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1