Malicious PDF — malware analysis report

Static analysis result for SHA-256 4553dcc6393c121b…

MALICIOUS

PDF

92.6 KB Created: 2021-08-22 01:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4765e5c48ef10eb6c98cc4a5721b9f6e SHA-1: 944c918652ebdd0e9a78a3dca7963fef1e17eaf8 SHA-256: 4553dcc6393c121bd73c2ece4f460cb3eda95d3b4e80ee80dd2918b4552d828e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083321580769---2847401790.pdf In PDF document text
    • http://4bx.pl/public/file/kinizufivojulapoziton.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/gukawavesefaferosuzowe.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/66049819484.pdfIn PDF document text
    • https://xn--8--clcp3bi.xn--p1ai/files/vokutimewa.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee623b785e---96205287637.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/50749563613.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfa895bbf8---sukewabumiliz.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9138e42b66---86611476232.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/xakebegigupununetogikaxup.pdfIn PDF document text
    • https://mytopics.it/uploads/file/jipemejiduvotuf.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/36443721837.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/sijilulawadewabesitalodup.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/81c71d3c66571c7fd980da62d6c0743e/99454951235.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/zimidutozutozikopo.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffede9268f---50416990598.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160abf5efa1b5e---jibumedaturikoxilexobine.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606f424146a8c---15745275547.pdfIn PDF document text
    • http://richardsonfamilyreunion.net/clients/7/79/79e100fddb184f5a3447a495e7c481fb/File/74269676457.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16076a4371b606---93351600810.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/gogogajovelinos.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/t89605bt4fni8aao3ud0qua641/rawitaxezawivapadubusu.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/miforatelutewawom.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/rarogokubifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+many+eggs+can+i+eat+on+the+10+day+green+smoothie+cleansePDF 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_off000104d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D9 11180 bytes
SHA-256: b5d8a3c8dd15e6c6933e3d084a29110b91e054120a365fe2d4687dd1bb68e5f4
font_01_sfnt_off00011ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA9 17340 bytes
SHA-256: a1156053e4db75662b8f496f4c7632924fd562b8b0692c0a272a6c4988e5bd7b
font_02_sfnt_off00014b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1