Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f8c7efc8c7fd4a…

MALICIOUS

PDF

86.7 KB Created: 2021-09-20 18:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bfb3740a8fd1988f1e9ddac01cf80448 SHA-1: 40279cf329cf1659038762d9dd7f722e3bfefdf3 SHA-256: a1f8c7efc8c7fd4ae617f6a600b7115cb4439a8ba27e45eb23ea1d1fa2611c42
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to direct users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript potentially facilitating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://boissee.fr/userfiles/file/malurumawi.pdf In PDF document text
    • http://microcement.ua/userfiles/file/84874037811.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210901_064903.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/rinunisugos.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/2538538124.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/gbfhugjll536lau7vu0odd8q96/jumubotimef.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1630985188.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210913103627_p4xeg6.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/soxowexamofamefobelenus.pdfIn PDF document text
    • http://bubb.cn/up_file/file/xejonemazol.pdfIn PDF document text
    • https://togeltop.net/contents/files/lefefelurife.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/furopovelazoxekovura.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/57632622349.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/64881607985.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/guzisasov.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/padalirufiloweluge.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139b33de5b50---42102398496.pdfIn PDF document text
    • http://nincity.de/inline/file/18677278876.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/wusekufaxu.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/91691828298.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458f3845312---puvumepexikax.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109141335358527.pdfIn PDF document text
    • http://apart1day.ru/file/76955596854.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/80682953015.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7728b3e59---42423615965.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/vejidezuzotakeweki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=anime+watching+app+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF037 10812 bytes
SHA-256: 2b0533ace2df2bb6491ee26a1394a39264483e69554e60e446645be1345df20d
font_01_sfnt_off000108d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E6 17260 bytes
SHA-256: ce4aed2c3fe12869898c90b0788d39db6136cbfa72952d6f56d10e9bc165406b

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