Malicious PDF — malware analysis report

Static analysis result for SHA-256 65db57290157199d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-05 14:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c306f9dd098d8f0d27fa1fc49d5d34e3 SHA-1: 1f71ea66b6bcfc467f6d769e578128978533b8d7 SHA-256: 65db57290157199df26c81766cd08b0314174002f1988db75fd8c2abe84f6948
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. It also features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3051

Heuristics 6

  • 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
  • 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://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/85sn31v0e33bkv0nbf9ak6m80i/73235864061.pdf In PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/wanitamuvonabejigol.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/wajonuzimigedakumi.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/67423530458.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/norimabasururusakuratu.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/42125694411.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/lexovafaguwuruzutonife.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2696405f7961e5bf8d3fdfbed4e256d0/gofenefo.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/fixobagujigetujukoniso.pdfIn PDF document text
    • http://dkind.net/userData/board/file/zamivosimotupadoxaxop.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/guxefibegumofev.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f58c811209---56540306123.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c064137a77---jidejaniv.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/peserubakoxunasesuzugofa.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f7cc382e4---69506691941.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/58266511130.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed36ee91c4---balixefubanabutazoxa.pdfIn PDF document text
    • http://ligneus.hu/upload/file/78566138562.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98c08137f1---90182693719.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/15745735598.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160948a6a75070---57129929863.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2268c4b92---11494117032.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/pevax.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ec9e90a1a---guzowifutikasa.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/sowonixubugufodeziwekajit.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/sebaxurapuperorurezipefeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=maquina+de+coser+wertheim+%2B+manual+de+instruccionesPDF link annotation
    • 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_off0000f08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001089e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089E 19836 bytes
SHA-256: f48be4a03d7d87dfd568cd68f8298186c85fae688c71ea952208d78219f19fdf
font_02_sfnt_off00013ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB1 10960 bytes
SHA-256: 5eaffa9d770fd7a6cf3433e19558bfcd58e0f1efda6798c25468a7078b76f108

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