Malicious PDF — malware analysis report

Static analysis result for SHA-256 567d28033cbaf497…

MALICIOUS

PDF

97.2 KB Created: 2021-07-04 23:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d07dace2e375a26606bc99ac76e45698 SHA-1: b55c67cd610395b84be4680988ecf66e7860d1c6 SHA-256: 567d28033cbaf497de07e99e20ce61879223029697693c0c081e5f0f19af4a22
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://basisangka.com/contents//files/lagelukamozewepifaj.pdf In PDF document text
    • http://orhs89reunion.com/clients/77823/File/dewufa.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/dezanugunizugowizuwuxe.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/zefobajedasa.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/188e2fd4d152398d85d9c982a748f401/97231742508.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/56013711456.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16087d9947c7fa---gazoxevabed.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/9601413874.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/sop8v4rjb1tuorudcfoogcjc7j/25450906644.pdfIn PDF document text
    • http://sclifeguards.com/clients/16854/File/fopojevon.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/xewosuxoruxodifaramibare.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/24721389760.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1abdb89e62---69364245064.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961f8e8f5a5---vesozoruvonavudaluk.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/d0bff76c01fcf9c54e9d9624710a2b91/19000708313.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/1891433339.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/jegimukeje.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/20135182942.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/49500554884.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/64303298648.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/6pek11cck7frssji2jbrias2d9/lezevubotejefomikadejag.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/logegogefuzin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=chocolate+cake+with+orange+buttercreamPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDE 16232 bytes
SHA-256: b646e4e99f19ac05519abaf59ecb91311bfd919e7d59cfb2ca623a477a188405
font_01_sfnt_off00011366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11366 10956 bytes
SHA-256: 7be2f036db091a000876e96bf239903c29c86f671fc0ad1cb912731140cad06a
font_02_sfnt_off00012cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000144cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144CB 18760 bytes
SHA-256: 26fe430787ff99fe26d3ecbd0910190bc6c9f6fd1e7a5d3ca2db5ba69f67a92e

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