Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d7da4a6323683a…

MALICIOUS

PDF

83.9 KB Created: 2021-07-04 06:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f66f75c9bbb3cefb2de1a3d29a882463 SHA-1: f3ca44f65f338422900482eced44dec078d6cb44 SHA-256: 50d7da4a6323683a6141d9cb92d3795512ee1cef428d793b14ae27c36a8b6f3b
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to potentially harmful content. The presence of multiple external URIs and link farms suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://alternativecarrepair.com/userfiles/file/35095695158.pdf In PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/nvu2tqkckukdvsvf9nre7buss5/48312084928.pdfIn PDF document text
    • http://yuha.be/_files/file/xiputarotezemeses.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/7fa2ef1023eefcffb89ac80495022305/vupojaruvonimogipirobifi.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/pgef8pk1s978hjo7f7embo9l48/borakekeniwofetowinaze.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d14a7934e8---gavudoka.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/dokefefunupenematoz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b70bd79474---38217847834.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/j5e3jc57tns50icffudfm1bqlo/beserimetifutigamudenov.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/lomulabija.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/bea1c7ef18ddeac9f1f5d2289bcfa0d3/lakewepezuvedofelub.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882409ee3e5---fotiv.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/77759626768.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db7e92b456---4951095318.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/530e970d685026f9bb5a271c21bfec94/8083004090.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/2a6c727b1f796a872f64ddab42ad5486/bisanafujirowig.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/61aea43e4681d4c1c88ca13f79efbd3f/2902095036.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fa907bcf0---xibatusofutesupofa.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/tugalujuwefokutogozomu.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095203ca35ba---16945244886.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/849842469571a60b0b2194d734fcc275/kijexowiseke.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/7a041b5c15b710da2c0a861724eda873/57178245862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=chemistry+9th+class+chapter+1+notesPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 11004 bytes
SHA-256: 4e002b60c514b88ebf75427a0105532466138e8d4d514c396e2db48285b839f6
font_01_sfnt_off0000fcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BC 17476 bytes
SHA-256: 7ab85050386a5cb482d62f120810565fbada1ef397eb1ef2b46a014e37126ba1

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