Malicious PDF — malware analysis report

Static analysis result for SHA-256 a195847992c32bfd…

MALICIOUS

PDF

64.0 KB Created: 2021-09-11 00:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54ab1643fcd128d008bbdeb101fba9e9 SHA-1: 229ff53b0d3503a4edbc49600ac25ebbf0509933 SHA-256: a195847992c32bfd835caa25ea69fc30cd2444c200b43f8857215a6ba1c63e7f
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external links, many of which point to potentially compromised websites hosting further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7082

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132b62a36e01---25183598539.pdf
    • http://tandartsindex.nl/images/uploads/18647394785.pdf
    • https://menuiserie-sainte-anne.fr/userfiles/file/pedovakozepudezidoj.pdf
    • http://gurukripapublicschool.org/userfiles/file/tevobobemitijas.pdf
    • https://jiu-hang.com/upfiles/editor/files/32814613329.pdf
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/56457110349.pdf
    • http://achwvs.love-mrt.com/upload/files/12461619896.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9c115c3fb---47514982186.pdf
    • https://maychieuvinh.vn/upload/files/5975556994.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161326fb50be92---7288623590.pdf
    • https://glaskunstcentrum.nl/images/file/tupiladok.pdf
    • http://gewidor-gmbh.de/uploads/files/zinozevuwiwelisirisepugi.pdf
    • http://droneducational.com/admin/userfiles/file/13025647260.pdf
    • http://massarentearchitettura.com/userfiles/files/41507766416.pdf
    • https://venusnvs.com/userfiles/file/77509409361.pdf
    • https://inprovitparaguay.com/ckfinder/userfiles/files/19326287022.pdf
    • http://biaikatolikus.hu/files/file/xozemiroros.pdf
    • https://kaptenhoki.info/contents/files/vasufazex.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/040gfl9mcgh7q3n36f5ep0a8i2/60261967765.pdf
    • https://ringid.vn/ckfinder/userfiles/files/supuvubakamuvinex.pdf
    • http://cuboni.com/uploadfile/hong202109110547355196.pdf
    • http://211.129.1.225/system/ckfinder/userfiles/files/tawinefukonapedosovafe.pdf
    • http://highlevel.pl/userfiles/file/nodurowonezojewosi.pdf
    • http://wellfoto.cz/pictures/files/61751621955.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=epic+seven+apk+download
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB61 16792 bytes

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