Malicious PDF — malware analysis report

Static analysis result for SHA-256 674a8e52ce7e80d7…

MALICIOUS

PDF

89.3 KB Created: 2021-06-29 01:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2dcf2a41a3272cf336eba8684cc20027 SHA-1: 24ab67f050b8e1bdacfac7b008924da628de1ed4 SHA-256: 674a8e52ce7e80d70071b4a4c09e9f135113b97d9870e2a6ee4144bd0563931e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. It functions as a link farm, with numerous URLs pointing to external sites, including those hosted on compromised WordPress installations. The document body is heavily obfuscated and unreadable, but the presence of multiple external links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://cructi.ru/uplcv?utm_term=general+training+module+practice+test+2+answers PDF link annotation
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775fa377540---69552069445.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b609d741550---levedofi.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/7ina225if0aq58oeofefhrmlsb/patepidazowoko.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/1239295777.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070c4da1b9ce---23743690905.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c14920c3d41---31203847798.pdfIn PDF document text
    • http://christopherdallo.com/file/2078634780.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/jalowaxidevopobozezawo.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/69567951471.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d8b252e44---11501337306.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/06/202106251147234918.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/31264469379.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/14936d1445b31a62b85d20dad0ea375e/pixemolupamigoravifonuka.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/e693d00773dae7c042bd8aebd9bacb76/diwedisarop.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070eb3d2e403---46385078046.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160849ee46d75e---xubinogi.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/zenoniturusubibuvisufo.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/besufivafo.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/mufukelijotedi.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/61d2f56ab3b4e4cb727ec6d6a787d21a/sitejarosinetufedizag.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/27018299967.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/iuqh8h7g4p0hj54uau98c7v4me/gibebovusipagip.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b46799b659d---21564396681.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1370f6e617---21316789905.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/judureri.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/21032486842.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/wisovurutavuledobozi.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_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 11204 bytes
SHA-256: 9c932596c69e7af02f9a8b2aec6057e77621cc6df189252d59345f671c8ca71e
font_01_sfnt_off00010f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F65 17592 bytes
SHA-256: 45c09cea5348037f8b8990f387c69e5fb6878d8b8331ccf72700b6030232eb99
font_02_sfnt_off00013d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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