Malicious PDF — malware analysis report

Static analysis result for SHA-256 c809ac0563f1c76f…

MALICIOUS

PDF

89.5 KB Created: 2021-09-08 17:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b31714bbfb16458814cca79fb65a8167 SHA-1: dc6b77aa670b2ecc7f88d32b4dea8d8222b6922e SHA-256: c809ac0563f1c76f6ea47dc317773ebe95a9ff9495a2ed691eb150491aa11632
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, indicating a potential for malicious activity. It also functions as a link farm, directing users to multiple external websites, some of which are hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coniperfumes.cl/js/ckfinder/userfiles/files/vawujeri.pdf In PDF document text
    • https://kultmotor.hu/images/files/vutoxos.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613888aece676---zusikozo.pdfIn PDF document text
    • http://rentaruedas.com/files/others/52864080528.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/20578731589.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/simakurofir.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/texomasokevojedunirunawed.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/85850814999.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/tasepeniwuduwopewak.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/lamubimaxumomizibuni.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/etqpa5e5clam757cgjjgteqbj2/puvurananukurujusala.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/87540125421.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/tikasanomojeda.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf10ed74b---62654656435.pdfIn PDF document text
    • http://meta-min.com/files/98782056194.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/vafafik.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/gezesuzorigifotik.pdfIn PDF document text
    • http://islandpointfl.com/userimages/gobepawatubazulixavopi.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/33179826253.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/riden.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/45580258752.pdfIn PDF document text
    • https://cargotavio.ru/files/file/kefiwozaver.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/80778336544.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/deovb7tnnfa4lhs62vjljkovea/13771853938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=l%27occlusion+intestinale+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_off0000f122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 10604 bytes
SHA-256: 4887a4e9c86d69f162fd8621bac5b8770040e4bb68d9ff454bd58518022643da
font_01_sfnt_off0001097e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097E 21928 bytes
SHA-256: 203c92828653a85ebda41714b836a5e1c2b888ad7354491a6b9a4bb278d4c8fa
font_02_sfnt_off0001405b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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