Malicious PDF — malware analysis report

Static analysis result for SHA-256 429307f45d07c84c…

MALICIOUS

PDF

82.8 KB Created: 2021-09-13 21:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4078ac4cad8d533f937d244d43f0a157 SHA-1: 020d3ee10dfc8fc501511689939cc9e47c873bb4 SHA-256: 429307f45d07c84cf89b67a95d334779f4d57e77c19fd7866ec14adc5574b6a5
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload or visiting a phishing site. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://harrodsrentacar.com/public_html/userfiles/file/35626822422.pdf In PDF document text
    • https://majubesar.net/contents/files/84101151296.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/wivas.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/18756827201.pdfIn PDF document text
    • http://houselandia.ru/files/tubosurove.pdfIn PDF document text
    • https://casaalu.com/luutru/files/dinidorulefajotivogusexi.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/dd1c09bd57271b56d7668dbcd5e56284/21529477855.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/pebotefobefikewuwel.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/63046425263.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/43117452118.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/gazurefag.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/90572386726.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/1916379815.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/40631951547.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/zitusomiju.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/wuvefelefope.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/pupug.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c9f25bf475f0b59fe353d83093ec21b3/81043104211.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/sipuba.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/78200893023.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/vaxerotonarew.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jf4gla072dd3g2cqci9lfvdno3/livisakakopalopiva.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/53611658185.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wiwuridenokunajupulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=best+live+tv+app+for+smart+tv+in+indiaPDF 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_off0000de22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE22 17808 bytes
SHA-256: ada9797c3e36a3a2caae21e491af152a7fecbe5859a7279ee721a1b12f11fba1
font_01_sfnt_off00010c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12448 10776 bytes
SHA-256: 79630f16191c39836f11b587f3acb4f8f36abd48171325c5b8bf24763a1fadf2

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