Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad4c3cfa5a79063…

MALICIOUS

PDF

85.6 KB Created: 2021-09-16 08:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79b51813371acd2b36396bc4bc80d3dc SHA-1: 411616468d3080025dae112f41719ac2924913ee SHA-256: 2ad4c3cfa5a79063ad9c7f5b601e1c03a556b6ca22a49f2e2fcd5524817d65a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' in one URL indicates a potential phishing or SEO manipulation tactic.

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://drafthe.ru/uplcv?utm_term=how+to+unlock+android+phone+with+password PDF link annotation
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/mamisopetewubopaxibiwa.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/sutevib.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/lavuzupovobewu.pdfIn PDF document text
    • https://faceless.me/userfiles/files/2224997451.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/fozobox.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3e52a4575---23861044431.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/74071554009.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/kodovoluzupojaduzimigo.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/67631681787.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/24096268902.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/71357908839.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/57475387347.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de897e6c6e---kenafokaruwapukopumi.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/toremiroxinidedunanivebod.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/13361324725.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/11199225309.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210916062407.pdfIn PDF document text
    • http://rayanchem.com/d/files/53937877806.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/modubuzivo.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/923c95c5fc43d8ec3d7c25543066b2a9/17765337400.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/41218572067.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422b3280da1---32515774429.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/uh4ocs5jn95vkhi9p7vv35m4jf/jewosofakemojufivu.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/vekiribig.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_off0000e839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE839 10880 bytes
SHA-256: 4e062a712ff1057e47d72f475ab0aa3583397dafb745fa91fe0a41f1cc5a25f6
font_01_sfnt_off00010153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 17916 bytes
SHA-256: 5a49d8b7f4a6d72e8eb4d2e1a2913245aaaa8b234111cd5d92c28fb798178b08
font_02_sfnt_off00013047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13047 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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