Malicious PDF — malware analysis report

Static analysis result for SHA-256 d951a60b3e01a81d…

MALICIOUS

PDF

72.1 KB Created: 2021-09-20 15:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 56935ea6455d84d2eeaf7287bdc1580b SHA-1: 8132e04df693bdb5cf3318788a697733e16c00fd SHA-256: d951a60b3e01a81d73df63d15bd3ea9da761bd77ac275fb87776ec72a9ce22f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm pointing to potentially compromised websites. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • 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://drafthe.ru/uplcv?utm_term=human+evolution+time+scale PDF link annotation
    • https://investmentskillsgroup.com/images/userfiles/file/73808364056.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/69116486786.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/70362404016.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/jafemoxavekanutuvomomo.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/22840292046.pdfIn PDF document text
    • http://medi-sen.com/files/files/mimuzidofikavenusuti.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210909_BFC97581440707F8.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/dabesafudovosogexigi.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-19/20210919201010392820.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/25316540405.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/22857357537.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/80165093558.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021918556496627.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b10fd39f0---tevumive.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8a908acc8---97939393166.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/xitidajeta.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/14930378984.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161404a45020a8---xanotetajuvesodelu.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/wijam.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/25853881622.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/wiwolovanipaburafu.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/2947232733.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e29c55982a708cf043655e5af4f88384/47380683213.pdfIn PDF document text
    • http://recrute.fr/files/files/76357791895.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_off0000b9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BB 16232 bytes
SHA-256: 5fc3970ffefd8f155d72e34a33ef77d2586f7ba8678fd73b3e776235d4162348
font_02_sfnt_off0000fb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB14 10448 bytes
SHA-256: 20389e0839bd36083df33be6b56091414c8e72922dd6085fc57e81892056ba49

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