Malicious PDF — malware analysis report

Static analysis result for SHA-256 18deadd00c76af18…

MALICIOUS

PDF

111.7 KB Created: 2021-08-13 07:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 592f75ba99bf3082b36579b488dfe03d SHA-1: 329dbfc572f916b02cd25310ba3ac1533a3d1f65 SHA-256: 18deadd00c76af1855c415882e8af84aa658b65aec71b0f7e21efbb5b2bf5f04
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or redirect users to phishing pages. The presence of numerous links on disposable hosting and compromised CMS upload storage further supports a malicious intent to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://taixingchem.com/uploadfile/file/20210809171532442.pdf In PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/6c1eab3421401cf0d5c177c84ff2c5ac/mumexerejetu.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c93644ed63---76402182260.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/2b99d0d7c5bc625283d8808302912a5b/fezudozizonumifemexi.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897c0bcd45b---16653080344.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608444e9acf6c---peziguwedefamizazuve.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/xuzipanivejusiwofejo.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/58153328278.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e434ab5aaa---16629716007.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/pigaruxuzikowenipos.pdfIn PDF document text
    • http://brainerdhs71.com/clients/0/08/084bd9d902c6a1e3ee48703551c87841/File/xolejenukogirawinaxut.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/89933787357.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/58010001810.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a791ed5ca---58634022435.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1610f3b0cbbbc4---kuvodufuvul.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/jaiv7e7vjd81pf06el0p37fgkc/xubisixugis.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610904efaedc5---gesaxaponajezakoxug.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fa7e3313f---dikonu.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/35874340887.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104b93bc5ded---49673438614.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160700865dd8c8---81276252961.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b27b9241be7---57165677515.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df463a4927---30065593303.pdfIn PDF document text
    • http://capital96.com/userfiles/file/14014536218.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/vafujijatolik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ejemplos+de+hom%C3%B3nimos+hom%C3%B3fonosPDF 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_off00014fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FDB 10656 bytes
SHA-256: 5826b2a75a95537ee3d56f704d021bbf3c652ff60a950fd32500239eff3d8787
font_01_sfnt_off000167a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167A7 18420 bytes
SHA-256: 96c6722be30086d0d60f6a87dc79fe2fc00f09fcf1c2164158f5a5b430e1bc18
font_02_sfnt_off0001969f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1969F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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