Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d63b73396c0b811…

MALICIOUS

PDF

85.2 KB Created: 2021-09-16 23:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d6914d81ca68d090fd80f8964512c03 SHA-1: 1d43e4a42bf09ae5a18f9034524b19b23a613d9f SHA-256: 7d63b73396c0b8119c31f5c8b094224b57a1f5e1f3cc54f19e4cc02400020077
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many of which are part of link farms hosted on compromised or disposable domains, suggesting an attempt to lure users to external sites. An embedded JavaScript stream was also detected, which could be used to further obfuscate the malicious intent or initiate further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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
  • 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://medvor.ru/uplcv?utm_term=4g+only+network+mode+app PDF link annotation
    • http://flirtproducties.nl/ckfinder/userfiles/files/mojumilowexojoduwowesogox.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/67431484424.pdfIn PDF document text
    • http://puisan.ru/uploads/file/28088606293.pdfIn PDF document text
    • http://vuason.vn/upload/files/60267761080.pdfIn PDF document text
    • http://fxlcd.com/upload/file/81307315953.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/95849181533.pdfIn PDF document text
    • https://sjaindonesia.com/sitefiles/file/dufubojivajos.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb88e0002e---56783528326.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/478f0b2f1ad9dcc34082f680c3fdc10d/puxuwa.pdfIn PDF document text
    • http://glttek.com/userfiles/file/78186397152.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210901111824_1160669624.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/nineju.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/fojubofud.pdfIn PDF document text
    • http://confetti-seasons.ru/upload/files/97299807323.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/gosili.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210901050252.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/70712607744.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/cjv355f9k0fb9cgjbqsanfjde3/nusodefa.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3248bc74299e5e58bc882422ce6990d9/tebogis.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210901064852930918.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/71618488567.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135c6ee3e222---98985677529.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/dusububowepete.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/fitaragipelopupaloxokofi.pdfIn PDF document text
    • https://maisonforville.be/documents/file/nelomigof.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_off0000e74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74D 18124 bytes
SHA-256: 4aed0886d29e0fa514593fe324af10c2b913ab507f1b0249ccea0d544c648cea
font_01_sfnt_off00011666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11666 10748 bytes
SHA-256: c83c605a588416ba220600952e53865aea5e5722924bd49956e65905099b2292
font_02_sfnt_off00012efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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