Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0ada19413d2067…

MALICIOUS

PDF

76.1 KB Created: 2021-09-12 23:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c09fd903e4a7eb47c7f8cbe471516d8 SHA-1: 533ae1f4c8573723f0a83266c2b1d1c9d824602a SHA-256: dc0ada19413d20677dc82b68ab77fd518e40723e909d820de03968d8d944ac59
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Heuristics indicate it's a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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://hsdinstruments.nl/uploads/files/kujomatidudaku.pdf In PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/66616483910.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/72376695540.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/konanodemewugo.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/99238017426.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/tolofexevaleful.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/moxulile.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133dedfdfb98---rumejenale.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/gejaxivuxakawif.pdfIn PDF document text
    • http://sissonne.hu/editor_up/9241153211.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/53059513639.pdfIn PDF document text
    • https://slide-bearing.com/d/files/xizubudufujinijovagi.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613926fa38df9---35616468278.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3ce48c261---92628601583.pdfIn PDF document text
    • http://gestioniarmatoriali.it/43244500876.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/jizovigubezegalojezid.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40846228008.pdfIn PDF document text
    • http://vodova51-53.cz/files/balixomosumomimev.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/lomatesejulo.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/84764395405.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/dewoxifuwu.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/9181898951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=c%23+8.0+pdfPDF 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_off0000ca52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA52 17528 bytes
SHA-256: 37f8f8574a73d602654c59feb3d978fcd8214c4a9c9c4e202447cf270dabb827
font_01_sfnt_off0000f8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B6 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804
font_02_sfnt_off00010b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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