Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cd98b25595df735…

MALICIOUS

PDF

77.3 KB Created: 2021-09-10 09:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 511b428e2e63a71cf6eb6fd6a44c076b SHA-1: 9b6694ae53178ca00bacf99e7fccc9d76ff2f931 SHA-256: 2cd98b25595df735dc8dcf8480c4dd673fd60b7f3560a16926fb20626b897247
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or SEO manipulation scheme. The embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://jeyadhurgatemple.com/userfiles/file/xexivejatomavus.pdf In PDF document text
    • http://forter.vn/hinhanh/file/xometizafalekobebosediviv.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/gojorasoxofoxeputonisewo.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/356426015.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/87985986620.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec303edbc0---fubobifovimig.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/upload/file/50470902552.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/50618271574.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/54571350564.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/tfiiauk29ho8etd1h4brluirh5/87742848367.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/gawipokibanobe.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/13939884328.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/16534621275.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/mipanogabuli.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/5922702446.pdfIn PDF document text
    • http://wwsm-us.com/files/file/59214552786.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/gixoz.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/xapekab.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109080130347299.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/87074236873.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134b9d102e81---55915456270.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/73880533692.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/gomelefijurunetedevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=gta+san+andreas+flying+car+cheat+pcPDF 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_off0000c9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F0 17152 bytes
SHA-256: c2c462397311d343eab458e841ce639b93a4f3128cd1548f724778c44b7e01fe
font_01_sfnt_off0000f666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF666 10932 bytes
SHA-256: 873819dbd3ec1fee40859fc2f4e1adc2af1fd3f83cd601f433eb191ecf43df21
font_02_sfnt_off00010f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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