Malicious PDF — malware analysis report

Static analysis result for SHA-256 318c5ad311b5bfd1…

MALICIOUS

PDF

87.0 KB Created: 2021-07-15 12:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 19fbcd54b94987e5b4f37a9b8570b0c7 SHA-1: 9283edaa2f4a6bb414298a91c80e1f1f92fa51c2 SHA-256: 318c5ad311b5bfd136031b854fbedf35161ea30a05152bb287afbef5f621ec5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an effort to obscure the ultimate malicious destination. The document body is unreadable, but the heuristics strongly suggest the primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://tavio.ru/files/file/kotolunoba.pdf In PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/32645583316.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/2a091c6cc36be08668922c23de9db45f/patajap.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb5a1544b0---30291953702.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160755e1332337---badibix.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/87ab05aaed2cafdd77547cb3e9cfcfbf/81330437642.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/dumabegepojikinexuxixibav.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18889a1f72---saxubomubabunere.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b99ffa77930---domomefaz.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ak576oh5kd0s033b3d9psui4bn/xepexoburirokuxewuzopoxe.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/visejedutixibegoximowi.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210629191050_e2r325.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/67531233108.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/jjhlgj449vp0bue9vi37et6mof/71611748795.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/83600082005.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/7h4vlcqtjpine5pa56ienb4o66/jeguxonofevesemadutelujex.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d6260f8a0b2d2be6453d6bf1858b42a3/nakijukapafuboxuzinig.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be048379cb8---zokotuwusofa.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/303a057085fe56445cf4c22d0d114439/45041272920.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/87708807415.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081f4e4ed3cc---11318895718.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca7707ac36---muduwibowugaputupe.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/bb87ab99a64244c3498061bf148f7541/68341937651.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/mivofi.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/gsk1s4tnroceh8if9vk3bkvqb3/5759069270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=data+mining+is+mcq+answerPDF 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_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 10640 bytes
SHA-256: e4f61e738fdf645a56410cba1222c34e7058fe0b9209ba2ab69df01d229c3832
font_01_sfnt_off0001098f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098F 17284 bytes
SHA-256: 40eb7df7bc53a41c4c64cdf7d498fb97dbe022c96e6a52baa70f0eb8f0b4f4e6
font_02_sfnt_off0001367d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1