Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e2bd766b15b1cea…

MALICIOUS

PDF

60.0 KB Created: 2021-09-21 19:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b8ef20e1775eeab49bed89e9475afd3 SHA-1: 9ce7a7ea78784dadccf0a1b9ff71420e6e0019bc SHA-256: 9e2bd766b15b1ceaaaf49ff186df9c6e60a5123546bbc4ee4f1ade4516634122
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites hosting other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or conduct phishing attacks. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8243

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://queure.ru/uplcv?utm_term=naruto+x+boruto+mod+apk+download PDF link annotation
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7076202e8---zetimidiref.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/69609779504.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/89733087908.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/fevoxuxexotasar.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16142b35a7a653---keparalaxe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cb68339d9---nitiwizapakog.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/39103271379.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/74823670444.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210908155001.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/tilutugiwebopururet.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/kexunedavafokexi.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/megexefafolilabe.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109041410159281.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161424148640ab---midajulemo.pdfIn PDF document text
    • http://youil.org/userData/board/file/80679250799.pdfIn PDF document text
    • http://519pf.com/userfiles/files/46919620619.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/72300696756.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/33004488208.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/92007657050.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/23733485724.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/692eb016fc86c1394b4d7f879d2f7b03/fafeb.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/pafuxakefogiloxexubexa.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/zowesamerijifosutupa.pdfIn PDF document text
    • https://limsurempat.com/contents/files/39532399018.pdfIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFF 1872 bytes
SHA-256: 7286ebf10b6160c9da72d5fc3cf1f7f2560605c729a3ae36a169f4463a46d3d5

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