Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5356d16115c491…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 22:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef278dfb44c3e3fa5b3f9d70c7f69be7 SHA-1: db74bd50758d0a0a349b5a25f2ab21393d775662 SHA-256: 8a5356d16115c491df97f14b4822ddf6ffa7928a9f1b9aa4917a26d914e45582
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The primary IOCs are the URLs associated with these compromised sites, which likely serve as landing pages for malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/j4vn56ot6qcarvegbmil5isdhv/86759765.pdf In PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/31fcf9ce542ce4c7e2e1dcc406f921b5/lagubuwitirujorikuwog.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/40266813498.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5b26da6e7---47109600706.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/43140245482.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/69242044124.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/tenod.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/wegutinibuwiwo.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/a4b38f201d4d2052d437aa01b370af5e/97364790828.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/famidejemarufe.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/68975089289.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ddee0967be---gusiku.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/6691895430.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610c4dcd88506---4347611118.pdfIn PDF document text
    • http://computerdoki.hu/user/file/kilubitebivuxewomepobebul.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/una0iquurukk2vb707gtmkbsbl/padulowojazetojiw.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/zifewosexugura.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/7eb1c1290385db8b1bd57d443a2694c0/ruroxebibofizame.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/51849724708.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e47d14bbe9---gomamakegimaro.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4405dac2f6---rorevupidujinalibigew.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/87715832160.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a705aa688---87098095232.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160dc1d175f2f0---bokapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=tieste+seneca+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_off0000de75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE75 18928 bytes
SHA-256: 5f9d8f61c67350d8afc24d43febf2dbd16366794f561e873233e9174a66cb134
font_01_sfnt_off00010f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AA 10308 bytes
SHA-256: 8143a8969f8353f60ae91a3af98487e892eefabaa321d0f94ab22e2bb09e8447

Open this report in the interactive analyzer, or submit your own file for analysis.