Malicious PDF — malware analysis report

Static analysis result for SHA-256 417d504e0fecf209…

MALICIOUS

PDF

75.4 KB Created: 2021-09-05 22:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4390d6b78e4a3c1855d71e7f1855238d SHA-1: 3a63e27da41ef87a12b4bc45600fddea77fc2ea1 SHA-256: 417d504e0fecf209108d3e41ce4be65be2209feb5376a0f804ccc4fdd3cd5f89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/83120300724.pdf In PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/77633307012.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c556c458bf0---zejatupurimufimidivaz.pdfIn PDF document text
    • http://bronia.org/userfiles/file/77054719800.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1610913d281eb7---sisipivasixezanupab.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/fekenalu.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/lifiborez.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/55307366498.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/8692c671207eb7ce67c5c95d695a3905/jalomijodojezijowiza.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/narofuzakawo.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/13148714457.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/7vjnr14ti098i9p5ejt9a7l335/19509031762.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a71e032a879---xasugureliriraburo.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160db7b056f726---92012508494.pdfIn PDF document text
    • https://mobilityservices.it/file/98905406720.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/goctv8h5fuuskmmei8ltb586h2/bavitawu.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/wukiwurazirazaliz.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/rafobejafegimuxovogiminub.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/kalevuxawasodopinejidep.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-7-9/20210709054638893075.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/5403805372.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/bfa28e3ce8f3cd4fbaa2e4108b02b387/xovurutuk.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/446830189c7550813ed2b39a949d844d/damabulukojapoxabozefun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pdf+to+cad+converter+free+download+full+versionPDF 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_off0000c4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FB 16388 bytes
SHA-256: b7396fb0723054967a89c4f5b07e754a44aeaaa3cbc389b1157901f959290264
font_01_sfnt_off0000ef1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10732 10724 bytes
SHA-256: 5844225ea1dedfae94b80be9ca3a00c1b2569a4170acd840870aa534ea5faad6

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