Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7dfe151cdaad5e…

MALICIOUS

PDF

58.1 KB Created: 2021-09-06 03:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e9a1566cc0eef0f9a7ee7e93ed3b746 SHA-1: a0cb85f558df38651b666f7c70db3c7d688ca6ef SHA-256: fd7dfe151cdaad5e0ad40d59fd6a1ae3840d9b99319d65c8e32617f5c806fe57
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, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The document body is unreadable, but the structure and URL analysis are sufficient to determine its malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8488

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://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff9af7b9d1---pesapaperiwawoxupum.pdf In PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082e4759ebc9---giwosowomejini.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1656aa227---jevutixamedijakudadazu.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/954a2d0303de6e3533e26b94723c9e9b/lasobarage.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/sovorenumazovefigemuvedik.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072809ce62b4---valesogipexebututa.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/32236593430.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acddd78fdbc---96994756506.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/98747469832.pdfIn PDF document text
    • https://sinarwaja.com/account/files/70908108888.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-20/20210720202041850075.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/6dv3bo94usu632l5etpvv65ijv/jisoxusagidozafez.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/55859453242.pdfIn PDF document text
    • http://koronowskasm.pl/file/66214029134.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/58429439880.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/7931783478.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/37929715458.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160906bf301df9---54394765676.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/bufelifizigerobizodafo.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/8gr1n4pcut8jbbtoat7u9tcum2/75201182124.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/nujitetelofuteperasomek.pdfIn PDF document text
    • http://rsst77.ru/upload/files/87753996074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=accounting+basics+quiz+pdfPDF 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_off0000cfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE1 10944 bytes
SHA-256: b89f788454e9b0edecf9e9aa40f2f1a1dd550474d53f6f9b22cd1631cf8e513a

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