Malicious PDF — malware analysis report

Static analysis result for SHA-256 026b858576cc085a…

MALICIOUS

PDF

77.2 KB Created: 2021-06-12 20:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0744828ef467af7cc26d4a66d5de0f3d SHA-1: 25aa12c10a9d091c310d592fcd2e55b94f7aa1c4 SHA-256: 026b858576cc085a7a98ebefab859c0beb4fb833aab44adc86fff7575f3452d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely to redirect users to phishing or malware sites. The presence of external URIs and link farm characteristics strongly suggests a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://pistant.ru/uplcv?utm_term=tough+questions+on+surface+area+and+volume+class+10 PDF link annotation
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070abc981e83---dexuwunivavavegeboboli.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/3133b104cf4a7f439f9a986a54353203/buvobar.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/24544674063.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/donumapepogopivulepigejo.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087a0c302eef---43208804693.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/adb59f1b6b999c367ba600456956cf4c/77039371797.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc3058184---5645239133.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086a9d05aa75---laxadoposo.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2f3cc5a71---68375069666.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160aacc5ca94d2---27692927767.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/84070846701.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/q4tsj87jn0ptke9ei7heu7c8bj/zerataje.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/322598052.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/itup2o8e8tnfdi1so15q1dgd2p/divowola.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb0305b891---pimokebijogef.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/vexidemekiwawos.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/f3ebl1tlq04od0tt4vtn5veb9j/naxuw.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/985ab1e3e552e4fa584f6c5a3071104c/48762947688.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/mopufixetemixevuleri.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE880 5764 bytes
SHA-256: fc9aa90c732b74722da46b204b39745f7cfa8d1a9e6c5a2b15b38e503f162ab7
font_01_sfnt_off0000fbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 13492 bytes
SHA-256: a5bf186ec04e968a4fcdd11efcb224824e08b1f113f7c7e0866c4331f0c2f1b1

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