Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1cbe04adbb409c…

MALICIOUS

PDF

46.3 KB Created: 2021-08-22 02:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4185abafefd0e537078b1346542e1b97 SHA-1: 2d6ed2330d9e71a685a75e1d834416dd82430a10 SHA-256: ef1cbe04adbb409ccfaf596d06168a5116bd9c7e8d4a900d2c6489c5c6cc9920
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9056

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://nhuadailoan.vn/upload/userfiles/files/78385249034.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e658c00708---kajaderunaginovemujetem.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160941b388738f---ziwin.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9372c318b---48248918548.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078b5e3dcf1c---waxikewifaxidemoke.pdfIn PDF document text
    • http://2440027.ru/upload/file/91278293195.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/xedezotep.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/19246333156.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/guzanexawowijurirag.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/32729932505.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/35346243209.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5215ea9b49---60788492213.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/35730347922.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/tisolixeparipo.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/0bff42b8253a349b875328dfdaaa7312/476044586.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/68f73ec3bd864a8a1cc9b3e03b98c8e6/10092294381.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/624ee56f91ca2129bdebe162c13f0b8d/56483997878.pdfIn PDF document text
    • http://cooperclassof1970.com/clients/9656/File/sebib.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/wikibenug.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/jukokuxikajul.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/gebokupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=research+methods+for+the+behavioral+sciences+6th+edition+quizletPDF link annotation

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