Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25bfd66f8b7c93f…

MALICIOUS

PDF

78.3 KB Created: 2021-09-14 10:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 37b13e984d2be950694349b709b34b31 SHA-1: a9b1755d935d990f80b0157226f012b35a30277d SHA-256: e25bfd66f8b7c93f27b5a490077458f1ada64dc6ea94f1295a4ed105ebd79da6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crewmak.ru/uplcv?utm_term=11th+bio+zoology+book+english+medium PDF link annotation
    • https://ntc-container.com/upload/files/xesobisiva.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/72754265580.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/guvofazexelajaweno.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210903012250225375.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/d9ea0b817e41acd3d9eeaedb3f72408b/sareja.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210902103114.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/62900455876.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/vedagunaruluw.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/30368820219.pdfIn PDF document text
    • http://tai-group.com/upload/files/kejatogiwinozaloz.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109031444334066.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/42259510465.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210913_000504.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/95224191825.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/60332660362.pdfIn PDF document text
    • http://sciattella.net/images/file/vefetimun.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/64332839111.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161325ca739858---80621533958.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/46739032838.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/rajese.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/48053958733.pdfIn PDF document text
    • https://cecprint.com/images/file/62562724499.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/58055881702.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/92490766998.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb51180744---16521663780.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_off0000cb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB08 18376 bytes
SHA-256: 894186cb71944492ec3321286be65413ed4eff22651ea9a4eb4a5a8ea75e30a6
font_01_sfnt_off0000fa78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001128f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128F 10892 bytes
SHA-256: 9fb0c7aa42936f6e7ba6a6dbeab758988a45843f94b86704e9dc0b3b292cb197

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