Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc38c6fa7f26a4f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-22 22:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec81a692d68dc214239c81456cfb70d8 SHA-1: 5cb3b3491172667a789baee55a3ce149ab189899 SHA-256: cfc38c6fa7f26a4fc4ffc901b97af642569dcd2f199e942792ad44cb926ed9a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be disposable hosting or compromised CMS uploads, forming a link farm. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to direct users to external resources. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://oniceh.ru/uplcv?utm_term=persona+5+royal+live+wallpaper
    • http://sitoad.com/bbqjoekey/files/202109220150293314.pdf
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/nimujule.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161445b3f229f4---43273270143.pdf
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/boxaguxamelinowogidamel.pdf
    • https://funbugs.ie/files/file/satotawati.pdf
    • http://divelife.kz/files/file/99255559656.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/29142370324.pdf
    • http://metabolit.ru/files/file/79645969181.pdf
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/fazabefinevigobijamomujoj.pdf
    • https://5703n1n6999-6a55.com/contents/files/71808960651.pdf
    • http://hoya-system.com/uploads/files/202109020537043882.pdf
    • https://terracetemayonetim.com/upload/ckfinder/files/39088668239.pdf
    • http://hutnia.pl/userfiles/file/tataxo.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7646101905a74fe41bac3cc14afef0c5/16140959931.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8e712853a---26127411689.pdf
    • http://myredm.ru/uploads/file/gikezawupe.pdf
    • http://kahasat.cz/data/file/36392376372.pdf
    • http://leeclinic.kr/userData/board/file/39436221135.pdf
    • http://odnoklassniki-files.ru/images/uploads/files/89454016943.pdf
    • https://jpjplumbingandheating.com/FCKeditor/file/nabupewedasanutebo.pdf
    • http://wujipacking.tw/upload/files/gufepa.pdf
    • http://wang023spa.com/userfiles/202109file/2021090303594070554.pdf
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/30211909441.pdf
    • http://clingac.es/d/files/87604841534.pdf
    • http://naphotelbangkok.com/userfiles/files/49657587819.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16146607b0e5fc---tatalisobox.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C1 16792 bytes
font_01_sfnt_off0000f0d8.bin
ef03875e0f5f55ae5bd63af0ce197da2e80f9b244320bfddd93ae45f1972fd77
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 10548 bytes
font_02_sfnt_off0001091b.bin
77bcef5edf135815ff978f4df49cac1f1f3e4af627a8bf0b40e47da65716abc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1091B 17144 bytes