Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17ddb094a559e6f…

MALICIOUS

PDF

69.3 KB Created: 2021-10-05 02:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6b54b8acb0baabc49d57f8f0c9333a19 SHA-1: cc2d4adac24b084a3f03f3fca7259f5e87da5b55 SHA-256: f17ddb094a559e6f4413dff8f0816f74912e1e1b7a1497c5878596e597d7033a
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV. Static analysis reveals it contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to these external sites, which are probably used to host phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4270

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://sfasg.jp/js/ckfinder/userfiles/files/sopezebojozeroreduvota.pdf In PDF document text
    • https://vaynhanh365.net/contents/files/88337889166.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/sitamilunefere.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615344bf7f332---zufojavu.pdfIn PDF document text
    • https://shiksha24.com/userfiles/files/72145848992.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/5323785052.pdfIn PDF document text
    • http://yulintimber.cn/d/files/87303650131.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/sitot.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/99752632093.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/jasel.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/44681810189.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/32123739802.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161452b7de053e---37167597540.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/4b398f24372ad6038099810bbdbf13c7/13304247483.pdfIn PDF document text
    • http://labonscafe.com/userfiles/kosuwixudemifezerenezam.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16148d715548f8---vanuwanavube.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156856b9bbbb---xafazubumazirul.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/dafifanosawegafato.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/mitovavi.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130bd79df2c1---zovezikuruvolevilofos.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/jawusixekudorenifumedife.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/86764405518.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2019af344---xogukofufopuziwi.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b717602a61---lavematipurigagejuwedo.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/rilules.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=moses+at+the+well+in+midianPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE459 10492 bytes
SHA-256: 5653a1f683464a77397d0e92b2faa99f780c982d0ba26c1fea5cee2b987a052b
font_01_sfnt_off0000fc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1