Malicious PDF — malware analysis report

Static analysis result for SHA-256 1585a3872ae60a81…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 23:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39f9dfa0f3ec10f9fb704259f8799280 SHA-1: 65a63164c93764114eac00433ed4b887e8b9149a SHA-256: 1585a3872ae60a815ed6d4de58aaebcb6eadab5aec84b81db5b101ee6f9efd88
204 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a fake browser update or extension. Embedded JavaScript streams and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggest a multi-stage attack designed to download and execute further payloads or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://queure.ru/uplcv?utm_term=naruto+senki+the+last+mod+apk PDF link annotation
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/kusokefukawivatanisada.pdfIn PDF document text
    • http://klemanpince.hu/files/file/4774855397.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/tibekimidenepizesuboleza.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/53281236235.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/tejokidiku.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/negojobidugixo.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/25186039180.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388bed64d21---tafumavewuzukenaba.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/3927753811.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/64573907097.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/40100051903.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/95026732331.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137f1534865c---4323894525.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/98457983826.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/neluzekonuxafezifub.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/8380949923.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/40364513962.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/fepowexukitexewile.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144c0b480e9f---12431898617.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/benupotapip.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/nuwedovatazuged.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/jazusaxa.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/mezaneme.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000e060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 18360 bytes
SHA-256: 233a0421dbbfbf8044a921eb3e7eb72d8fd57174738effaa47f648ccc1ad5c17
font_02_sfnt_off0001287e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287E 10828 bytes
SHA-256: dd349c12a242354d6e66b5c347ce30d99c8fecd29217047449d634ab054202e6

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