Malicious PDF — malware analysis report

Static analysis result for SHA-256 743945360f49ba8d…

MALICIOUS

PDF

79.5 KB Created: 2021-09-01 15:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f98ef8f1bc0175ead5118bfbfe168138 SHA-1: 31edd3d5bc151092202fe79b5ec5ad921d65c4e1 SHA-256: 743945360f49ba8d4473b68e6065af36d605b42675339dea8c76137b072ca1f0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of 'utm_term' parameters in some URLs suggests a phishing or SEO-based lure to entice users to click on these links, which could lead to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://crysiq.ru/uplcv?utm_term=icd+10+for+lactose+intolerance PDF link annotation
    • https://contabil-fiscal.ro/mm/file/namulomadusaremadatazejar.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa17fb40cb9---94614874275.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/rcc6rkl03k51mapm3kjkrf6ed3/56298730935.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/zuvimijiruxugiguzoj.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611934797830e---44151865382.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/3is6ech03n60s5luhf5rmt0nlp/80753236987.pdfIn PDF document text
    • http://capital96.com/userfiles/file/paxaketitikuxokudowo.pdfIn PDF document text
    • https://badoza.net/userfiles/file/kabajorixopafelininab.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/mefuxaxogibim.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6bf3def0f---mijefiza.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/1d0a039f234078b437958f8c506f6928/kuxezarafuselepanirewuda.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/7288434766.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/tepezipilenider.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/bareg.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/10412594171.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f77f64c34bc---6011159369.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/sosifalixisuwajunowopuku.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/mujixapirugujigefujeju.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/47523731175.pdfIn PDF document text
    • http://ccadl.com/files/20210704185113.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/60775248526.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/d9af18e4be93e021cd897422804f8dea/70334560775.pdfIn PDF document text
    • 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_off0000d37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37A 17196 bytes
SHA-256: 9260ec0052d2fa3b3b33cb85fbaab5d4cdbe8c1514f5afd1f29fea5474394ec9
font_01_sfnt_off0000ffbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D4 10592 bytes
SHA-256: bd42931fa7150e4e276a48c4a443554eb7e7dbb2aeca20415d7fbc2500b5e599

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