Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4cb3e9505674c5a…

MALICIOUS

PDF

62.5 KB Created: 2021-09-23 13:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1cac4774a4579c32a9a82844bf0cb685 SHA-1: 06fbc9d46596ac64df672ca8d114fe7c6705e5ec SHA-256: b4cb3e9505674c5a46daf91fd67237993a39100f5c59520275edfd6027d5826e
154 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or link farms, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farms on potentially compromised or disposable hosting indicates a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7708

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 https://drafthe.ru/uplcv?utm_term=watch+high+maintenance+season+2 PDF link annotation
    • http://j-line.ca/fck_upload/file/88684649472.pdfIn PDF document text
    • https://linardi.ru/files/file/92620128188.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/5fd1f3194c1a205c6626ace651307ef3/vomadanifoxakowijol.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/tilekolakepezu.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/xuvemoxako.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161383a7cd2268---10014295615.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/d1b6db6d299ebb7d35a2ec1ae17202ed/62008591839.pdfIn PDF document text
    • https://denimder.org/resimler/files/nubakozopavoto.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/tabudamuxomelupekiroru.pdfIn PDF document text
    • http://skupka54.ru/upload/m/81889908267.pdfIn PDF document text
    • https://migger.dk/userimages/file/lejizelirozozukade.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/bozovujopamo.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/21015697025.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/kugibuketapevijixo.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/62074340473.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/82728994884.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/70343398169.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109221805143668.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/pexuxawi.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/9540f0b56ed8eb65eb9a260b1c0af2b4/70811504921.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/20648523783.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/74509835618.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/36843421229.pdfIn PDF document text
    • http://ranchobg.com/img/file/jusodemazajo.pdfIn PDF document text
    • 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_off0000e2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F2 10644 bytes
SHA-256: b76827e7a8fd403281cc040c7cce4a3a04ee42b8dd80310928b96271bbf2636b

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