Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61e1d2ff272d472…

MALICIOUS

PDF

96.5 KB Created: 2021-09-01 16:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 76c9cb36ce960b142c2728a6a11c3e21 SHA-1: f81900f1244c1414b4fa76d6539a17e93446a6cb SHA-256: f61e1d2ff272d4721324dd2bb9d9ae81587d928aa960a025c1a672332e7b0729
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f6fd78d1de2---jukafefenus.pdf In PDF document text
    • http://polish-house.com/uploades/fckeditorfile/fupiji.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/2t7db8orcvm0pdcsd8lepc9v5g/gegivarosepitexez.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f7c978716---dojemonima.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a22b857140f---fonemiwow.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160997a2d08379---fenozilowomatidup.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/kelejuwixu.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/nokovuwuponafimarito.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/75753377380.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/e05f472245ceab7083a1ab6e90725e16/73322215453.pdfIn PDF document text
    • https://seerupit.dk/assens/file/37220037387.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/95064318266.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/28795491923.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/67179037614.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/fosuwefigukowowabaj.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/pozobijamikogaz.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/50566084386.pdfIn PDF document text
    • http://mayamalay.com/clients/874202/File/17836799688.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075175adc96e---keluxamis.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/7d2daf651cfc3827d4406986ddf9809a/pofuwevamulanatataguxas.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com//ckfinder/userfiles/files/66063418373.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a27dbe9da3---78292491066.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/vakew.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/55253901321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=subject+to+restrictionsPDF 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_off0001145c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145C 18176 bytes
SHA-256: dd62b98e97042a8a1e844e23ca0f03b245eeafc18cd99cca28025fb30d964b50
font_01_sfnt_off000143c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C9 10460 bytes
SHA-256: ea86a87f584d6f77177bb4d2ebb2f5e2fbe0eebcb3d1eb017fee5d69c2e71f03
font_02_sfnt_off00015b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1