Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea875ef0db91771…

MALICIOUS

PDF

93.2 KB Created: 2021-07-05 11:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 564fc35547aa5f23979aa034a951012f SHA-1: fff7f1ed1457db91c82ba611a983b5a3cca3b0ee SHA-256: 0ea875ef0db917711391d9beb69700cc6bd07a551c6813d6d541d12c02779d65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the URL structure and heuristic firings point to a malicious document designed for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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=mount+and+blade+warband+blood+and+steel PDF link annotation
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/89b6c8aeeb26a00d929ed01a9cfd987e/vimekekamofugu.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/dexeguvunivokidafivize.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/pababedosifuxajikajokafad.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/lf544pk8jq2mhk2cbkgjd6kba1/gebozetesidiniwujugirun.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/mumaligikiti.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/selibaratomufezelon.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/14697968921.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/7a825722eae7971d24cad3a144a9b190/kizuk.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/46ccda0e1bbad8bb2df4db39190cf350/juzevizobuwos.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/2884387465.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791ceb62450---49610928176.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce4d291cef---detop.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4619e66d46---manusugalejana.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc394460bd---kujevenozowavo.pdfIn PDF document text
    • http://vo23.ru/upload/file/turereli.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923bad05f40---sovipowal.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/qedhamsunam23liemapano07fm/nisexilop.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/65930742335.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/jozurokuxu.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcadb7bdf5---6770365112.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/bupevap.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/89eb47d210c17b323e3c75877340b4e4/9138763816.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/fewifavovisoxu.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_off0001080f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12021 18072 bytes
SHA-256: 52cac0387fbe3c5b8ab0d6ecc562d6570df81c49e55ce7a5d574aef1dd9adbd1
font_02_sfnt_off00014da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA4 10468 bytes
SHA-256: a49cf5a4d9ca7e5d2226efb9775d672853f687789a3cab2de4258e8f2cdc831a

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