Malicious PDF — malware analysis report

Static analysis result for SHA-256 99dfb344c1f96c93…

MALICIOUS

PDF

85.4 KB Created: 2021-08-23 18:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 719eaefa92ecb8dbafc97a9c74b0211e SHA-1: 28d2ba2c90d41d4f379d99430f3771a8c86c871c SHA-256: 99dfb344c1f96c93caab5dc9d48ef48b884d8147105e2876181f00e575a5f8c9
176 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised WordPress sites and potentially malicious PDFs hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of numerous external URIs and the use of compromised CMS upload storage suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6ff312768---27195701752.pdf In PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a85b133e636---jerumakelokegikuvole.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c003a5f5---30288737125.pdfIn PDF document text
    • https://wrd13.com/force/file/pumozufejidotunelebe.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/mobixiwewomabupizipoziva.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/21540848536.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/22976427070.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/8uq69t0s3jcmvp6fmrgkuhu6t3/8736504433.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/71784199495.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/6080825203.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/41316679341.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/ab7233b2ef3fef8a961b832bd83eb853/51313541620.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/8dfqqm6htfqraqkk7sds2kk3hf/wovep.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/xizadozajetavapakazimomo.pdfPDF link annotation
    • http://hlqh.net/userfiles/file/20210814033321_188790991.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/rofixiganipoduforit.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/gasotuwutulepitepi.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/62857156586.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/nexoradurivab.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c95cd45e29e---81166237233.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160839112269ac---kesipovuvowimerozepew.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160813cc9bf54a---folanadakag.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160acc94a23b88---popogemimop.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160da34f8a3d8d---vexemazijinizo.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/75392926224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+did+the+scarecrow+in+wizard+of+oz+wantPDF 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_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 10664 bytes
SHA-256: acb22993bbb2b0c547755e94db5cf09e7bfb833618607b6534ef1575903319c7
font_01_sfnt_off0001017a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017A 17580 bytes
SHA-256: 7970ea8a95dc5edef20820bc40f63c22176019925a110a7e9c52480390f909a1
font_02_sfnt_off00012eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1