Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6a71d554c3db4c…

MALICIOUS

PDF

55.8 KB Created: 2021-09-17 07:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4292e13767ff159b6ca066f18d234d9c SHA-1: 7d0eb9637f1eba1119ca1bf2141e9552c50db088 SHA-256: cf6a71d554c3db4c473ab8d03415de41776e22cadc4c237f38f784edb457b676
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to potentially compromised or disposable hosting. Heuristics indicate a link farm structure and a ML classifier flagged the PDF as malicious. ClamAV also detected it as Pdf.Phishing.Trojan. The embedded JavaScript and the nature of the URLs suggest an attempt to redirect the user to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6436

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://185.33.116.142/~bbyacht01/upload/files/gutafifonunabinamijogobe.pdf PDF link annotation
    • http://biosystech.com/pdsFck/file/46366382203.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/28672885974.pdfIn PDF document text
    • https://sanidom.pl/img/file/wufebuvotafe.pdfIn PDF document text
    • https://baptistfriends.org/media/fowolexijojimem.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/dikegazudepeluputuf.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/5524777154.pdfIn PDF document text
    • https://granitnet.hu/editor_up/bagideliwuxuxopogoku.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/423636bb73b3654d3e5d1c9dd78059c9/nujabakovixefopelogofefut.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/4901270733.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/57098948816.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/17888506382.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/31641485810.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ef00bbdfc---mesesojebu.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/mesazelapudisosupulo.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/zosizedexazojubetum.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/73058130638.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/93099998612.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edc7ecccd8---28408743752.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/b7dceb8862f0464cf9d8ce3c79f939c2/91236259755.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/potimepejadevedosokoz.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/fawabegafozis.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/13hr1dpcufv05amkp1qh2m6jij/8490494084.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/ximoluge.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/lufipoma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=android+sdk+root+pathPDF link annotation

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