Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7957330bee6c94d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 04:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5730ddaac943b97f6393378f424b58be SHA-1: 071e4776bf45bfe3983ef0c651145634a1633bd9 SHA-256: a7957330bee6c94dcafa088fc2bb1854f73fd8577a3a94fa0c28988775bab3fd
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://philabc.ru/uplcv?utm_term=mulan+full+movie+online PDF link annotation
    • http://toonesk.com/upload/sugozumuxefarabuv.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/72285770955.pdfIn PDF document text
    • http://goldia.cz/data/file/wefusatafajapododukawes.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/dusisiwuwugogopol.pdfIn PDF document text
    • https://fishuntpesca.it/file/57305397766.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613867f11ab81---43545803969.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/a0dd0d0623e814f5f3affa3e26e1b0ba/nudedawatopobaba.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/88317785993.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/40121185038.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/xosiludibeboximomum.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/texikasuwufepeze.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/26116944685.pdfIn PDF document text
    • https://ijpdua.com/contents/files/36513664453.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/57232178333.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/naxanesigofuvi.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/6d9d9501b13d0f87bc5042911f064871/48660699623.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/68501103871.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/9854416390.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/ropimuretidajosubo.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/23059175560.pdfIn PDF document text
    • http://ty-int.com/files/files/guwexos.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/rosulifenimavebe.pdfIn PDF document text
    • http://aa-nusd.jp/ritekebowixisom.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7625e133c80932b6586ba0141b7bf5b7/74495193154.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/vonagejuxotowo.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/pilaxusefabogiwaz.pdfIn PDF document text
    • 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_off0000dab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D0 10168 bytes
SHA-256: 97e2d6487a8bed1824ccaeef9f92725bfeb2b30cd57ebb15078b60e36941d53e
font_02_sfnt_off00010981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10981 18524 bytes
SHA-256: cf7f5b12f18e8c89df56c2c4698782b9a6b3b750dbc8bc2bea973d1aab339d06

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