Malicious PDF — malware analysis report

Static analysis result for SHA-256 af026e4b9b42d2f4…

MALICIOUS

PDF

78.6 KB Created: 2021-09-02 23:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e7495682426cfa8e9d9450372f5daa1b SHA-1: ac1b58e3df66a36baa718bb6bca4c2c81a250f2a SHA-256: af026e4b9b42d2f4913dcb405b112dab9c00c5f606c6258dda6dd839f8f36edb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The presence of these links points towards an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/95c12a97fc80cbea9d01d42efd5960eb/89688606885.pdf In PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/32117226818.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/34122d599a0cd77c37593870610c4f39/mefefuvebuzigedufawe.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/zaguluniwunodosunixiruvo.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8bd27e189---34105378714.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mrh4c97t9n4d9rttkulk3pklp5/nebevubejewegaka.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/18449365991.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/18789507688.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/05230507526.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/nimiliwazebomoxa.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/ruxofopi.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/sosimegowukupodupa.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/98908035208.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210722_14A55EFA77F1ED80.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/kovovamejudesunobato.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/75179287336.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc6a2abc30---zukukilotituguteje.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/merezevivido.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/28367002275.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c6806f7d2---buguxomosezexixewe.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a914253497e---9715631513.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/e127d635a737046ac096241ba6384b2a/bebapen.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/147000c06d8438d04ef7aa2c48c7bafb/16727577290.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7a0dde702---44547079027.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/17304775420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=agriculture+engineering+pdf+notesPDF 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_off0000cbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40F 10712 bytes
SHA-256: c45947785b473c5eb944e9f94ed2277aba525d31e023da9e50886bbc104a6785
font_02_sfnt_off0000fc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC94 18796 bytes
SHA-256: 866f227df0949e73b7825e6e8621ca2b58c64a48d461c50d1c4407b4a997ad95