Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe22ccf070e4aa5b…

MALICIOUS

PDF

66.5 KB Created: 2021-09-29 02:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e059dd2f187f292be6b98744c8dde780 SHA-1: 6cc361390f845f81ba8f0defbe1d4aadb1272633 SHA-256: fe22ccf070e4aa5bd5f9c6c8aac166b41c822a85216784881785d3a44bdb34ec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The PDF also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links likely serve as lures for phishing or to download further malicious payloads, as indicated by the ClamAV detection of 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier clean score 0.2166

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://tonere.shop/app/webroot/files/userfiles/files/naxopenejivotakun.pdf
    • https://fptica.ru/images/file/18401994132.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149094156c95---39032555901.pdf
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/59028032924.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/4fb402751debcbe78212c5e83f7c3bbb/68604713045.pdf
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/sowomumav.pdf
    • https://olivier-daulte.com/ckfinder/userfiles/files/tisototujegogutulimako.pdf
    • http://yizhu580.com/ckfinder/userfiles/files/gegofijofefatidofi.pdf
    • http://niengrangchuyensau.com/upload/contentFile/file/30170287837.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/83c8ebed528db50a743b51bd7ac48857/14468174953.pdf
    • http://tks-forever.com/upload/2021/09/04/file/69414944968.pdf
    • http://apicn.net/upload/files/55938395890.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140887d69bb9---kisiti.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/34752192747.pdf
    • http://asia-test.informacittadino.net/media/files/2424174052.pdf
    • https://erdemlerkoleji.com/resimler/files/95792726303.pdf
    • https://alwillislifecenter.org/ckfinder/userfiles/files/83536847854.pdf
    • http://rockhousemethod.com/ckfinder/userfiles/files/17804333308.pdf
    • http://kaies.cn/upfiles/210919014841149987j1en3t.pdf
    • http://drentmedischadvies.nl/uploads/files/damelinedenuselako.pdf
    • http://lnshiyue.com/userfiles/file/20210920172100_90354088.pdf
    • http://flirtproducties.nl/ckfinder/userfiles/files/76904609447.pdf
    • http://youil.org/userData/board/file/bodorejajazopigabumoke.pdf
    • http://krcatikyonetimi.com/userfiles/file/robijekofoludabenotubexim.pdf
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/virikegukafupumimofe.pdf
    • http://gleb777.com/fck_upload/file/mojatode.pdf
    • http://amuseonline.com/absite/userfiles/file/nozoganekekupiv.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ghd+sport+tv+live
    • 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_off0000b31f.bin
e976fa5b6b9daa4e007d0cb874847548ab1a24b93b6f47e234d32b232697fd8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xB31F 15384 bytes
font_01_sfnt_off0000da5c.bin
231651df7b0f27214362ae2ca05601e7b5740b458442df4647ea82bb5b2883d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5C 10328 bytes
font_02_sfnt_off0000f1cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CF 16792 bytes