Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bd9c8e6d8c782d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 23:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6ced24771a7b7351588fd6ffc01b89b3 SHA-1: 56720127c22444b3d5f42d739506125a78e920c6 SHA-256: 91bd9c8e6d8c782d28c34631a904078d07b46c6ce16d8bfd9100d10d0e676c06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://pixomot.ru/uplcv?utm_term=it+chapter+2+full+movie+putlocker PDF link annotation
    • http://queensparkview.com/image/upload/File/loxomasopinipivadisujuriw.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/53171015027.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/94232784414.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/39885749841.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202196145783668.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/78062616085.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338e035ffe2---wawuvazusoses.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/wuronabupirutaxemije.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/zoluxotejujere.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/96694632243.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/39112357891.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/ligokoxipajeso.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/taworefefidoganugexijagib.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/bepusenomolu.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/42681912196.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/48766536724.pdfIn PDF document text
    • https://signika.pl/Upload/file/81864091484.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/72756382288.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/naneti.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136318ca4c5c---reneba.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7b0feb49a---vugabosibusiridas.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/57464303966.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/lorurigajofexusezafa.pdfIn PDF document text
    • http://espwireless.net/uploads/file/42967138169.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e14b3a64b---rafanitavelibaxe.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/japidin.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/11575425644.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_off0000d2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F8 20292 bytes
SHA-256: 13de032733759adce77a043d7e9ad6c032acd027f2faab79ef45d15429f8f6e3
font_01_sfnt_off00010722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F39 10800 bytes
SHA-256: 8087e4edbaf2878db3c15811d4b43f694af3cfaf68b7559e4475d45ac94b3e9c

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