Malicious PDF — malware analysis report

Static analysis result for SHA-256 115b61d1775b514b…

MALICIOUS

PDF

75.0 KB Created: 2021-09-01 18:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 56067c4e5b2394e28959a3840d90b983 SHA-1: b3172e52ebbbdd36a1f6c1086fd3bad38da657ac SHA-256: 115b61d1775b514be5805df36d5c47aae0d7796701648b3a0209052bd06daa3e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ahlhy.com/uploads/file/280330348953.pdf In PDF document text
    • https://binarbaid.com/public_html/userfiles/file/fatug.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/tasonub.pdfIn PDF document text
    • https://unosms.us/userfiles/file/jirobanovizeru.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9e3c50b57219283b30fe7e5de3322cb9/xafigitu.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/97030227895.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0469042001628798575.pdfIn PDF document text
    • https://carlojans.com/cms/file/4024782306.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/valonasasuzuwanugafoj.pdfIn PDF document text
    • https://eurocomm-italia.com/file/mebuwu.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/99994618714.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951ceee1fa8---96612498838.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/damozudu.pdfIn PDF document text
    • http://goref.ru/files/file/zemedog.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/cd69b061843e8843913f9477afb9f8ee/bovol.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd0ac55553---18775599387.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160957b0969009---lilugi.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a338e016a3a---74434594679.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757f30e7394---bikedi.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910a53e8770---zulog.pdfIn PDF document text
    • http://hhsbluebirds1967.com/clients/b/b5/b592d679e9980e62d9d56be1bfb8b6b6/File/63057843412.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/vefojamagifora.pdfIn PDF document text
    • http://cjatkinson.com/userimages/mekodo.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/9727dd1fed558a20b94a582b37d8c6a5/29327535719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=as+aforementioned+in+a+sentencePDF 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_off0000c6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF15 10572 bytes
SHA-256: 6a94bc7941f0437547eb6bc8f11999e312894993f89b6eda91272c228a45e814
font_02_sfnt_off0000f734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF734 14936 bytes
SHA-256: 1e46fef29b3b9d8a97f0b71df4ff5a389dc7cf77f16806afe3872bf5bc93df3f