Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f784dd461a963e0…

MALICIOUS

PDF

76.3 KB Created: 2021-09-05 00:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4ed235a8e27ce932b08d474a65e1f1a3 SHA-1: c6ba82dff0d8f04a683645e0c20d2ec7b285e589 SHA-256: 8f784dd461a963e06dc635c6a0f47f7a68d9a5994f8347c5c163466a3103aaaf
154 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. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6663

Heuristics 5

  • 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
  • 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://archism.ru/uplcv?utm_term=dive+into+design+patterns+pdf+github PDF link annotation
    • http://seatraderhk.com/userfiles/74670529049.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/70206907106.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/e1a9562636f396ae3031cc7c23fc099e/4115414958.pdfIn PDF document text
    • https://hoavily.com/uploads/files/80588296123.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/luzikebisepi.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/57018171906.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/81478576341.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/ziziridexikikimeb.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/74964578519.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/14733271184.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b398a99f476---41261015650.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/dabejemowiva.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/281815352701.pdfIn PDF document text
    • http://viewcs.com/partner/upload/dextfile/busizawosi.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/24724540791.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/1mmg5iotdjeld1i5o7tvlq6mb5/munerozutetamitowa.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfce3d732d---vidowugojomuxevoxaf.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129a39741ecb---bipopad.pdfIn PDF document text
    • http://hotelsandmartin.cz/files/file/divepikes.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160ee62df335ff---12146469828.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/xibexivewujepodunanel.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/6c0f864b0b4700ca582ddfc5a5da8edb/17649289689.pdfIn 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_off0000d2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B4 11036 bytes
SHA-256: 11114bec100aee45c1cdd95aa84c143d0e330c036ac9dea526a0e14b7c5d7343
font_01_sfnt_off0000ebf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 19200 bytes
SHA-256: 5d05409aa82f9bd0117527091c4c64729d5ea313ea0fe59759f0cc9fcc9d9b6f

Open this report in the interactive analyzer, or submit your own file for analysis.