Malicious PDF — malware analysis report

Static analysis result for SHA-256 856246aeedead679…

MALICIOUS

PDF

85.4 KB Created: 2021-09-01 01:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79efe0e21120828c4a2697e56c8f3c6b SHA-1: 8ec2c3b452b5b2e37d8ac42c9c3628779d0ae43a SHA-256: 856246aeedead679ff8d294aa123be2411bed05277080c18384a1ac1b564a786
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The file's structure and numerous external links are consistent with a tactic to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7f382820d35dc63fa615cfc7f3a3325d/802813822.pdf In PDF document text
    • https://cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/65773266073.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/3654835652.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8a8d5c03b---mekofujakag.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/22854282126.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/082223054235.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/779d52ac965aad2b088b906122085902/59322485863.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/23555501836.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/xisazudijeriret.pdfIn PDF document text
    • http://stagnesreunion.com/clients/e/ed/ed16748122b3ff8ec97113314e0446c4/File/84057758093.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160954adf75091---fefekovukovitorazitukixu.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/nanobo.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/sewabubewupamibula.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/poliwutip.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c01f64975---xaxopodezi.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742e1edbb91---84926686723.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/ximixesapatum.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/umdh7dmmajfjcahr7erjfmnb76/95736032688.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/87261238135.pdfIn PDF document text
    • http://ewtch.com/upload/files/mefipasaritidesof.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/97722190951.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/h3ubcao6bullgm1cnsqda7kiou/3461994294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=spatial+theory+literary+criticism+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71B 17840 bytes
SHA-256: 1c86a99976f19e1e97162f0e42cffe16d5a69c0a463c694c0f413a81bfe3f7c6
font_01_sfnt_off00011578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8F 10972 bytes
SHA-256: 428fc7757f2621a04f83bcf3126abfe80b7cd330f2d99250c568c16f6ae74869

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