Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c2593938c03eedf…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 00:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1475519f9a3097f26e3fe9bc9b3906c2 SHA-1: 7441d934fb0287147af6f4ad128ebeb7635ade45 SHA-256: 6c2593938c03eedf530f4f06a43e018c25f7016950ca0e39c68a9fb9011168cd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains numerous links to external PDF files hosted on various domains, many of which appear to be compromised or disposable. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security scans. No scripts were extracted, but the overall structure suggests a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://synerhu.ru/uplcv?utm_term=icse+concise+biology+class+9+textbook+pdf PDF link annotation
    • http://janjoling.com/public/ckfinder/userfiles/files/72527337703.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/75823724461.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/67102884646.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/93622907787.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/66918594354.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/11228776579.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/26541640491.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/misuvejakomeritop.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/zixujuxefuga.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/xoguzofetijelitinumos.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c05b28f22d---29635694623.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/60053093001.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/rejukepeseso.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/javaxinirutifegefados.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/moselo.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/161433c8391b72---17315208484.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/74415986968.pdfIn PDF document text
    • http://platcometals.com/images/file/pekelifofasanoreki.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/42465136001.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/sobobiwifujideketefodu.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/joroviregexikagovalibonox.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/98941072333.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/ponuxupazejubake.pdfIn PDF document text
    • https://blokhol.com/upload/files/xavominexig.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/l0j7e1ksvrcitjvf2mq9sk9in2/98159127543.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/24045891749.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_off0000dec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC0 11260 bytes
SHA-256: 103e38639fd33a0850cf72bd93438007b1c1dd67310f5b2de9a8a7f60038d927
font_01_sfnt_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 17664 bytes
SHA-256: 2c0a2ea0699c7da424ba750ab4f03c3b94bcadf0de31724f06a528bb9b9ef044
font_02_sfnt_off00012768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12768 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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