Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50bda66a3f9f4f9…

MALICIOUS

PDF

77.3 KB Created: 2021-08-08 01:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1f51ebf1c67a56eeb77e8abfaaa92928 SHA-1: 12bc22ad2c8e543f11a0bd44dc05d854c4617709 SHA-256: d50bda66a3f9f4f994853256c6f5152b2007c3afcce2fc06bda47e50f8b3f2a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with several heuristics indicating it functions as a link farm pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of numerous external links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d383ab3cb28---91591936017.pdf In PDF document text
    • http://dioceseofniranam.org/userfiles/file/22621070375.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/dalezesewodedugenawilapiv.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/7087311182.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/ketimefowi.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/89300151553.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/lvmm37pkm6unpkua7o7f68kcfv/81959813625.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/6b54b85114252b650044bdc0916f7794/43251820815.pdfIn PDF document text
    • http://grandbarnettfamily.com/clients/a/a0/a01b80d98e57c38af56892ab55e7d82f/File/jetavexuvofuzodafofase.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfacd664ff4---matodudopanokifo.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/foxebawopipelilabidaxebij.pdfIn PDF document text
    • https://airshow-bg.com/file/litavumulotogoxerijakan.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/12637934705.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16074b2511407c---9000291952.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/s606c7lib746d0he6ivkm0l764/wupidosakenumefenozeno.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b9bdc9a86---74664657329.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/38328590441.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/36946699005.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/68198553500.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/jekojujoj.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/162def7247e20b017a5e5fb7518cb2ef/deririlugo.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/rivotumedilulenimadurukan.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/vakexivoros.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/novigelewafewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=libro+de+texto+quinto+grado+formacion+civica+y+etica+2019PDF 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_off0000c6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 11692 bytes
SHA-256: 4c1e01fa145e117dc4cd3c3cd594ee08704dbc97f0a292e9dbeb3eb7ad0e49e1
font_02_sfnt_off0000fa35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 17476 bytes
SHA-256: c23d05ebb51986b30c9447665e981ae2c7eff99207264563b199fdc6f1c78287