Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87715f4c0a949d2…

MALICIOUS

PDF

81.3 KB Created: 2021-09-23 16:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2cbe05608a8c6068df2704b4ddb8a5db SHA-1: 3a500f2d0f39f3233369105eaf5bb8a9567a2b45 SHA-256: d87715f4c0a949d2084459836a6f608aacd786bcbc06de2cac464d40756ed932
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that function as a link farm, directing users to potentially malicious websites. Heuristics indicate these links are often hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=pokemon+go+free+balls PDF link annotation
    • https://csmgh.net/pevron/www/img/file/75159337678.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/94135403873.pdfIn PDF document text
    • http://hodori247.com/uploads/files/pifadef.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/55669149156.pdfIn PDF document text
    • https://migger.dk/userimages/file/89294719191.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/99b74gc2u4feaut9ud2af2brl9/69314786110.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/gudalelemumot.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/88034856115.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210916123235.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/51028754072.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/rokatevifezir.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cbd025628---tobufofisofi.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/xunasoxusezasolejef.pdfIn PDF document text
    • http://skisun.it/userfiles/files/48503028162.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/17611094858.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/75904059617.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/34939875244.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/maxividetusojajuvibi.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/75187963496.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/tivokaxum.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/c64a1375a08d7de1589dfd8d93c489b3/xokedukunogebikamo.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/023c47e8aa107b34c2bb53c409fe2f0e/85376409284.pdfIn PDF document text
    • https://tivicom.vn/upload/files/37567031675.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/fl15hkflujf6ug4ilbh2pqu6c6/tisulu.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_off0000d6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED2 18744 bytes
SHA-256: af371926af244f74ee4780fd4f9e9a4b98118a5b7a08b9164ffec17b49a6477f
font_02_sfnt_off00011faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAF 10600 bytes
SHA-256: 2dfb75fed4372c1497344c4ddc7558b0d1fb39bc1ab7e050e51686e72bc739a6

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