Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d90b9f04e6c7948…

MALICIOUS

PDF

63.7 KB Created: 2021-09-01 05:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9bf42af315b1f6b7c6e8b7a1ebd6edbc SHA-1: 4e4500af0ebe4c61ba0f9f2cd1045495a5fbf0df SHA-256: 5d90b9f04e6c7948f734871fd44dee4f37a881a93c9e964d7212841bc9bc49d3
162 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. Several heuristics indicate that the PDF acts as a link farm, pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute phishing content or malware. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8670

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://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/80sa3p3ot8aptdort0eoj8upk2/15400681952.pdf In PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/2c27067eb38ce675d34b2d67a4204412/zazuze.pdfIn PDF document text
    • http://benrassam.com/uploads/files/torojige.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/11322459257.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/13383fb34c0939d14568277af91b8f13/32532174367.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/2299a9dd8da1f6cc49df931ccbee7b13/bidojirinazirobeloderew.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/42144753403.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/befoputedalosolazudum.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095a4a0b58a8---19350901931.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/vukolawiliwanenonojidef.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/10015396279.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7ca4d1454ccbb3a63e2416f8d22428ae/wutelazokik.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737f1acf89a---79533970992.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/91974656753.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/84204655380.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/bekimimorobijefaniviw.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms//images/file/35185695246.pdfIn PDF document text
    • http://harlit.com/upfiles/file/miwufopelinebubel.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/14733930502.pdfIn PDF document text
    • http://www.asslar.de/downloads/70375872519.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcfad51127---gomofinesinokes.pdfIn PDF document text
    • http://budka39.ru/files/visezunipamexas.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/muvefijizuxugen.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/jufumigexi.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e4bcc5868---40442969723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=can+could+and+wouldPDF link annotation
    • 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_off0000e00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00D 9988 bytes
SHA-256: f58fb7d3db3f4945b52a74627d17bf64c1413800c2a6aa843f02edfafc9fe8b8