Malicious PDF — malware analysis report

Static analysis result for SHA-256 242f68638f7cfc3b…

MALICIOUS

PDF

79.2 KB Created: 2021-10-08 14:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 86e7784d6a51b88bea8cc7984d4380f9 SHA-1: 50a1a1843faee471a2a6e72cc0422bc49f51f846 SHA-256: 242f68638f7cfc3b52a4dddf00400a3ded67f7f859216cb1ab3a95ccfffd021f
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://vrindaindia.com/php/joseph/uploads/file/ramefudalufazujituxal.pdf In PDF document text
    • http://roland-toys.eu/userfiles/file/4706156004.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16156919770ef4---gujenofowufekotevudorogu.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146bca48b48e---53582797047.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/turewatulilujudumil.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/23266017404.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/80e136cb66274e1a176ae51b04547807/karukofisudulubexebe.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/dovujebufosenarizat.pdfIn PDF document text
    • http://bdn10.cz/files/file/lixeka.pdfIn PDF document text
    • http://getdol.com/page_data/file/83777274354.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/92689980236.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/radafudetovevazumox.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/30850101839.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210905142316.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/54742051815.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/zomudoxex.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/zunekapivegume.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1615b38970ae2a---pokaxatofatamerevowag.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/tavidebame.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/qeg8u1hkvr232u5qjqpp2ic090/88968739490.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091616211036446.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/sunumujitus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=c+programming+and+data+structures+pdfPDF link annotation
    • https://mediaget.com/userfiles/files/farikixanip.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_off0000d112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD112 11048 bytes
SHA-256: 4a6c27680d67983a8eb6d3da71f36016d06fdda301250949d8fef4b628563436
font_01_sfnt_off0000ea9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 17420 bytes
SHA-256: 48408276a27eba61f275ddd002e11c3e7abd2add20c5fa75c6a7e3a08752ccad
font_02_sfnt_off00011740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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