Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea580d43a68a96c…

MALICIOUS

PDF

105.6 KB Created: 2021-06-13 18:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 91b54bed2c3902ab52620c416979ff17 SHA-1: 04a863d5ca1cc902c132b553ab25a045d484f843 SHA-256: 8ea580d43a68a96cb24ce1252033bf5efebfc59c8c757a5865f0b69aa4fb9141
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://allytemp.ru/uplcv?utm_term=war+thunder+aimbot+hack+free+download PDF link annotation
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/8ed9a58caceb14068e1669f46a372240/xipomitamididexebap.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/79053923320.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/23190464276.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/dixijozibigu.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdb0ace005---5912897914.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c5b04a0f6---96490938462.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5a03ac4940f1fb968509c88adb9526f5/logidox.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/d4fc592be6d7fc0988b5aa9b9bfff2dc/lugudow.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/3l2onb4hd2o350gd0fn6pf6kg3/molukebodezipitavubug.pdfIn PDF document text
    • https://aedwea.com/upload/foto/gubutunoza.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/tavotepadidosati.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/rvuiidv96g08qu132bej0isrp3/917244230.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/qm8bkmlndlqor1a5ui2afmc57r/savule.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/86378977507.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c23573d363e2c06e2eddae6f6db70d50/fikeleguwid.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b89721c7997---34185628510.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13577 5392 bytes
SHA-256: 6520a019255298a7fb460f785e9d57cc7c9bdf85ae3ab37e762920bbe64d3ba3
font_01_sfnt_off000147b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B6 3532 bytes
SHA-256: 16534ac6d1bc3b3bced805b18df54eb2e5cd60b339e6bdb6b548948bdfe84347
font_02_sfnt_off000155bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155BD 14040 bytes
SHA-256: 8d7c6a1ed6eaf97a3da8cd5a00e6619dc6fa7ebf10a877cab0c92c9738662c78
font_03_sfnt_off0001830f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1830F 16228 bytes
SHA-256: c33032bf90b0a6dfc2c38f2a06868b54a3807036e1f045dc5f14c83d4eee8419

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