Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1ff4ee8814ae82…

MALICIOUS

PDF

67.9 KB Created: 2021-09-03 00:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 122286b1d5c98d49b602de8c786443ff SHA-1: 285ea3c140edafe5abd96921e84f52846fca1cdd SHA-256: ac1ff4ee8814ae8242b14bc2c3582121f5bf8940920dbdab3827f969f4c2ea2b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6616

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://pistant.ru/uplcv?utm_term=harmonium+classes+pdf PDF link annotation
    • https://0900107678.com/upload/file/41038389529.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/28343440256.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22501984687.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/20047389507.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3afb3c786---43956788844.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5fcea83ce---pabek.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/nokimigi.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160844bc048fe5---54157860184.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/1635980656.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ed3542b9be360d1e7b24dcc6df581f8/vukirinutupamimaju.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/29214393613.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98a61c40e---bowunetulizusiwofigibiwe.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/wezuwudob.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110a056d73cd---kidutufivixirafutesixubi.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/52204069486.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c0f383408---vabufodabexizinijizes.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/tidosuzavelavinawegida.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/47353631675.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/valawufevirebogi.pdfIn PDF document text
    • http://beateromer.com/bilder/file/70423024934.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/21beebf60b6f19551c13c1e6034d1943/14647049328.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/zewopixi.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfa224fe7f---99842272050.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/dorepelidiziluza.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE581 18072 bytes
SHA-256: 87bb74a45c7b7bc0494b0c64179ba252b286989ab5d9066a4e93e2d6be98b9a1

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