Malicious PDF — malware analysis report

Static analysis result for SHA-256 451e1e0aea9d216a…

MALICIOUS

PDF

86.0 KB Created: 2021-09-18 06:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c59b399a1da79d6a1f2737ed062ceba2 SHA-1: 014d0e075ef7f1fb2612f27746806afd35467ba4 SHA-256: 451e1e0aea9d216a969d07d4f5e2693e694b62e344cc374084c6f8b23f9a8254
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.isgs.org/wp-content/plugins/super-forms/uploads/php/files/7f8b3c9de3443fe2f1f1574edac1f355/zamoninikeg.pdf In PDF document text
    • http://www.amedna.com/userfiles/files/12381975892.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/vovupomol.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/livoluzumi.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/27342666998.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/73672851382.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/mafovedulativivake.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/18370708799.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/jatuwuselogoluboxofupe.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/jefibizaxosubajonivux.pdfIn PDF document text
    • http://retailcop.ca/files/sonekoxerexutejunuwemajob.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/93426634868.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d09c05571d---zunet.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/dosolo.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/bazosibikabofaximop.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/tagamaxilawupezuj.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/19494167706133d2b534b91.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f86b03d9fa---nudamopefavadiza.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/kimumasob.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/bibonef.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/kubofulefogetarunejovi.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/56427346925.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/48632571358.pdfIn PDF document text
    • http://altus.pl/userfiles/file/xakumodugamawerajopipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+know+if+your+phone+is+ios+or+androidPDF 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_off0000ea57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA57 10932 bytes
SHA-256: 98ea7567cd5b88248cf43b280f9bb19ae461321e14b16a6e93904818233446c9
font_01_sfnt_off000103b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B0 17620 bytes
SHA-256: f6e8f541fe4e3ee886a0f8c35d7fe6981164989bb5748eae6b023d7d08dd618f
font_02_sfnt_off000131d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1