Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4bc668ed93ba5ae…

MALICIOUS

PDF

94.3 KB Created: 2021-07-03 11:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4cbe402fda9ef99a3575d795755f727a SHA-1: da34aa5b7da286c5580f85ddb97445e3080a258e SHA-256: e4bc668ed93ba5ae2c0a7e88cc2e4169c3fed597ca2b533a5472f07b08c78bee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation attempt. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://unique.global/wp-content/plugins/super-forms/uploads/php/files/3b141838bfa608b082ec10b3618eeca1/90991405900.pdf In PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a48113e2acf---fefuvefasedobitafo.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/8925fddc1bbe61cfdf3e534be696fd32/99381170220.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc650ac16b---radatuwatufaxoje.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/740dc443349260e70e5bbccc3313deed/ramakilo.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/8f00c3fa33c38af77cda7fadb9851771/vafotipu.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/f5d9d319e310b4d7ceae955ee64d2e1d/55129285269.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d5a9defa0---rerinafafadudetiduwolale.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51bfee5fc2---vadifozefawodoja.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/pogopuv.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/biritaxuvizugebeditum.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7474d88ffd168a9a7141f5728ba9dc8d/labawoxurilovevolajopumoj.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f241a2fe92---wipudarakosazunimej.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/1i8iruo52c3vknmbbovoa370o5/gatokulurotulixeni.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/dotuben.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/58c79094f0be251933fb934fa8ed889f/zutobigaduvi.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/xagejazagejumuzafisugano.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1624961404.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/47226759383.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0ed021b16---zitozuja.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50d3e832ea---jonuxipedisad.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/zanunokusanevifugalikanov.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609701545da7c---96707800267.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/nafiwitixeniredamuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+get+free+money+gta+5+online+xbox+onePDF 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_off000109bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D3 10956 bytes
SHA-256: c4c051e3d0d9f751afed06a31e5d238e1a280b8ad9557c10d42bef49a3ace480
font_02_sfnt_off00013b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4F 17736 bytes
SHA-256: 265144ae0a067d9abfdcf0ab96e41ab1766813bf469fb727e83f87d6895be8a3

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