Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9d3e2072610b00…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 20:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 21af900aaa50ecde8c27c46c6d97cc52 SHA-1: fa23fdbcac4a82e107705f23adf2f4bf99cb089b SHA-256: 9b9d3e2072610b00a9952b22938efdfefce05d548c2c8facebfe29f22b4f83d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a phishing or malware distribution attempt. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest it's designed to lure users to external malicious content, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://derey.nl/app/webroot/files/userfiles/files/ruwovaxo.pdf In PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/mknb8tf9k7na2qvulho14l0hi2/71455804300.pdfIn PDF document text
    • http://goref.ru/files/file/6529576338.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/xivirijonowulubajara.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/8785642107.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/23242318094.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c127c0761---19213201065.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3572b20d---85950644280.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/17425291815.pdfIn PDF document text
    • http://danielbushreunion.com/clients/41596/File/jomiviga.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/72864402213.pdfIn PDF document text
    • https://defi128.com/userfiles/files/60627254709.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/gavexaniwobes.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/goxedusijatuliveletoxo.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098922109991---sivoseveduw.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/novirur.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bd1f035fc---88273226217.pdfIn PDF document text
    • https://digireg.it/upload/vaxezerob.pdfIn PDF document text
    • https://begili.com/uploads/image/files/94286579691.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/snikhqpaf13msqn8ot17gat902/nuranejovudosazuverexufa.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/1bd58b9aaf36b8e0dd7c985dc64e9800/xugama.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/34153513804.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/60384355658.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/87226481026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=shiva+puran+in+english+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB6 17336 bytes
SHA-256: 9ac6aea30dab1c724ccd20bf967f56fd45139e40028d80c2282104d2ff446d26
font_01_sfnt_off000107c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C9 10800 bytes
SHA-256: d55b22fac7e9c72310017ec8950441d3e1bb38253d5626082393186e902e3139
font_02_sfnt_off0001205e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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