Malicious PDF — malware analysis report

Static analysis result for SHA-256 e223d0d3781ddce4…

MALICIOUS

PDF

80.0 KB Created: 2021-08-15 07:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2dfdb4c29549be6d97983405d2f810c1 SHA-1: 03b2b58e1ee100062fc7ef8f6a8f45a2799d67de SHA-256: e223d0d3781ddce4298abfccebdca461db498123993d42079890e128a0781e8e
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the embedded URLs and heuristic firings point to a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7978

Heuristics 5

  • 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
  • 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://odnoklassniki-files.ru/images/uploads/files/rujiwukefapavavebuj.pdf In PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609603305c52d---bafixupawoxatunujifatekog.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/josumokelokugunuw.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/guxoselaxure.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/85947010108.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/0jbpv47ee88raff99i1btplbrm/97453502686.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a41c84ed3542947f384d3454eec617ff/23935827974.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/1c1de7aa2f62f6c6ab46d05c25973ac2/80204160601.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/13587945192.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/15581789493.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210531150512.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/jutoguwako.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/0646a6f35708b78b896ea9878ddff6ea/jezolopenoma.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b66602fa---kujazolomibetir.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/renijinemuvasutu.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/fesumamirewodowidoko.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c515612fa---82317890511.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/tebujejefiladibotituso.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/rso5cmvlqpqj6f9vvad22494t6/nasipalide.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964da329120---wasejesikugipowe.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/lewexemufewaragarup.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/xutonudomixelibelavazej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=papa%27s+food+games+unblockedPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F0 17964 bytes
SHA-256: 18016036d459593bf1f6f3c85bfa87756bdcda44bba75cc88a3fcbf2d3924d43

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