Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b242e688bca06ba…

MALICIOUS

PDF

80.2 KB Created: 2021-10-16 04:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 35fcef553d70de06d2e761cfe448fabf SHA-1: 08729f631fbcbc2078991d13cbffd8362392a2da SHA-256: 1b242e688bca06bad4df10dc51ab6a5050f61352641a86927d4b60ac69cf98b7
224 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URLs pointing to potentially compromised or disposable hosting, indicative of a phishing or malware distribution scheme. The 'Browser extension / update installation lure' heuristic strongly suggests the document's intent is to trick the user into executing malicious code disguised as a necessary update. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://equalland.com/uploads/File/vumumafeki.pdf In PDF document text
    • http://tokstar.com/_UploadFile/Images/file/bujedebego.pdfIn PDF document text
    • http://millecolori.it/images/file/tapibo.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/30807937091.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/87376566226.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/615d3nt0qs3qkcg7kc7qpasjjb/23033283390.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/a03ad4c9ab5152e89daa5340ea8b3474/bukitadu.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/viwexomonutuzab.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/57757515375.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/9253717914.pdfIn PDF document text
    • http://lejonhund.com/upload/tetobejozonudewojutu.pdfIn PDF document text
    • http://hexindechem.com/upload/files/57240322591.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/napodagaf.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/11133099152.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/62d16ea12717d4f78aecba88cac2c509/37889763274.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/25315155982.pdfIn PDF document text
    • http://xsteelstock.com/d/files/31386317090.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/51514258878.pdfIn PDF document text
    • http://portableandcool.com/files/files/36389303926.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/37513239991.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/nifanusefeginurunolebekok.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/nuxafabipe.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/6Zflnl449io/uplcv?utm_term=grab+pdf+from+websitePDF 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_off0000d41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41D 10776 bytes
SHA-256: 2b636f5cccba375394576104c2ec8dba51236c83cd812542b6ee6397397afe11
font_01_sfnt_off0000ecdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104ED 17884 bytes
SHA-256: f7597d6318878627d2c27d9ac015fb0d45e584a34af3539217a6974ed3c91430

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