Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd4781677f0aa87…

MALICIOUS

PDF

76.7 KB Created: 2021-07-13 20:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 82843f1b873358859e2461aa39a6f8ca SHA-1: b1db2f6325d552d7d798875fbe7081ab8113f998 SHA-256: 6dd4781677f0aa874c7c32f020ee57b639a1724ef9ef39de09262ef2353437d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains a large number of links pointing to various websites, many of which appear to be compromised CMS installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the nature of the document as a link farm on potentially disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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
  • 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 http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae4282ad11---fawenirabu.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/k0d7so6s0a188essjiapd94t16/20157725122.pdfIn PDF document text
    • http://texmet.pl/userimages/file/xutozu.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/14110462765.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/kikalafeluxolinigeno.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073e9814a35d---puritifabutixap.pdfIn PDF document text
    • https://atlantidegattico.it/file/11248475954.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/24395613424.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837d6804569---welubowiwuzuvugo.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/radavofalo.pdfIn PDF document text
    • http://tinnaduraflex.com/uploads/files/80028989925.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16237746513237.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202106280916144545.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5cf4e298f---55587439445.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/8ae450fcf7e26a7570a72c1f27f2dc46/lakunijitiwezizokenenoje.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/neguz.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/vosonawav.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/3293940564.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/nojojeriporumiv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8f6fbc083---dadobutase.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/6e13c1707730bd11e5ba0aed2dcd07ea/meranodipusuxuxobixe.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/22183902828.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/5212779302.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4191d73055162dd9bd04a517b1fc5d04/zikaxakanit.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160de651ba9497---vodorideboxa.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4908a19b8---719923232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=department+of+education+numberPDF 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_off0000c869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07B 17068 bytes
SHA-256: a3b8ab283c104142de4f31aa004cc4c474024d6985211bd3dc21f5e0c74d3e01
font_02_sfnt_off00010caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAA 10808 bytes
SHA-256: 7fc8c2a0ea42ded20306d7ab3937f8ee5212b1a084ae9294ebbecf9bc9a42899

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