Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ddca04cf6183682…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 11:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c518eee15bda5bfdb84cce2de4f26da SHA-1: 9d9e54f47f1495437c8b05caf71e8339577b22c9 SHA-256: 3ddca04cf61836829eed90ab9b315f975905f6c58b4a2c238e9405e82ded80b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://orikon.net/Images_upload/files/xuwuti.pdf In PDF document text
    • http://zulassungsdienst4you.de/bilder/file/govafewevufizebari.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/32218677542.pdfIn PDF document text
    • http://metapolar.hu/tmp/kepasok.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/86485033889.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/kusafevanudevowizav.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f41e0bdd5---tofatikot.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/98814575577.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/64208940489.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/fijewalagojuwudojodas.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/21123186944.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16140f4a24bbd8---94227061818.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/70548955339.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/t6j5imrhhco2adoa9j1snqjlc1/suzukuredunefezezavusi.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109081147541014.pdfIn PDF document text
    • http://hidropro.hu/upload/lakavixuxosobubuvowarasi.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/zorun.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/zekidudozodesoxojeb.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/desufamidozulox.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/3755320938.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/laleretixefuvixe.pdfIn PDF document text
    • http://jobsmarttampabay.com/files/public/vikodasizejivogokirifawub.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/15939763797.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109070153248618.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/wolisukosedojivas.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/85974318985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=credit+card+generator+real+with+moneyPDF 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_off0000dc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 17416 bytes
SHA-256: a4ac81b8ce645bafd60671488d31ef5e38109ae8a95ebd300c11870c6c779e21
font_02_sfnt_off000121d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D1 10880 bytes
SHA-256: 230b14a0154980b323bb9546898bfb10f1064d43dd2387464de4e0d3706f5161

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