Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f2a0311e9b9697…

MALICIOUS

PDF

84.1 KB Created: 2021-09-05 05:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 858f18d0477ed5792191796d6ea7505c SHA-1: a91141b66b89f3e878e11f1039f5984bd08afa83 SHA-256: 46f2a0311e9b9697d19d6fa19be042bf6ff88899383a99d7f6d160e0e7819c4e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a phishing campaign or a link farm designed to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://oniceh.ru/uplcv?utm_term=christmas+worksheets+pdf PDF link annotation
    • https://giasutainha24h.com/upload/files/65524955054.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/dozibifoxumezu.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/xedebomuvipifu.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/ledudikumasapumagowi.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/cm8cmf8rgijv2etba1lcisf7mq/5764059079.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/vojezusoje.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/30780323514.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/vov9op4ha8hr193sqqvi05p2h6/zupepujoz.pdfIn PDF document text
    • https://birudongker.com/contents//files/67046621157.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210717_043741.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/50494323313.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/d817fa4afdec1850e0e0844b269ee3d0/nipaseb.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/bisarefujigi.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075faa0a4226---dupujobuwewupegegivoxerow.pdfIn PDF document text
    • http://luatsubienhoa.com/upload/ck/files/78918483370.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/82597395872.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bababb068a3---puzidiremitixor.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/fofovovifumasenav.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160828340dcca4---79554960660.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e01461b67---jigofesigosir.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a83f233c4fe---pubajasavabof.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/574a0587d9264432f0090ed4534438fc/20038986339.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b634c0a9e46---waduzefomefijisetariniru.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/11537485985.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/gikezewelusa.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_off0000e022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE022 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 10820 bytes
SHA-256: cfbbf2b21418603487d137d34453a16d6714478c88e4d5851a3d24399427150f
font_02_sfnt_off00011149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11149 19192 bytes
SHA-256: 8fa5311d9b7bd51e6460c91b770fc3a2a1a244b8bbdd7b776513dc1df7374e03

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