Malicious PDF — malware analysis report

Static analysis result for SHA-256 b781d71f1affc07b…

MALICIOUS

PDF

66.5 KB Created: 2021-06-30 13:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1b3ec9a352638a8378d3b05e1b5c61a9 SHA-1: 6ecf52ffacd8be63e9d0c841ccdac4200675c369 SHA-256: b781d71f1affc07b8d988937eb147b77b4db5fcd4fc13ad8da39172c22ee2bbe
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier also flagged this PDF as malicious. The presence of a link farm on disposable hosting and compromised CMS uploads suggests an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6468

Heuristics 4

  • 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.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/5cf61dbd6dd6b5f917aef7464f31101d/refegomegasuvazefo.pdf In PDF document text
    • https://hgb.se/filer/file/80340030329.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/dafosefuti.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/jezekabuwolewerijoj.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ccc66ad80---sosodalipovu.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/ruvulelukikonapogogimi.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/t9bk3dhom79msv07kqgphmgrj0/duminewu.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/66935259793.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a714a740776---99393987368.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f67a4448a---36962924340.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07059a88b2---befezikovop.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ad10fc19e8e---84133087532.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c518bb308d6---jewobumozutigepukudunudi.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae6808e5c---50425300613.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/50369100231.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a21b82efa76---rajipij.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/f1ej55ufkvrimfhurpghfjvbgd/rubizapabefilajew.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3b2vh5va5vl18f0s37g8nt74hj/47556187985.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/53431837647.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/68f885c7800449d67d39d1a1846e4603/91250145216.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/706edfc05bb06e8b5a6402be934b9e63/moxuvosikagebalowoganifet.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/9a61ac703d116fac5a43f69d97466341/9909739736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=guardianship+without+going+to+courtPDF link annotation

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