Malicious PDF — malware analysis report

Static analysis result for SHA-256 804e26841180adfb…

MALICIOUS

PDF

77.0 KB Created: 2021-09-07 05:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c7a5f057ae7056f3f0761f66ec2140b8 SHA-1: ea06d997d07c58a7ad71add68045c8b767a7eb14 SHA-256: 804e26841180adfb00593976a9a095f8b31429296d61490ca42dd7a771eb6740
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to external websites, including some hosted on compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ascensionchina.com/userfiles/file/xasuwovizimotukewa.pdf In PDF document text
    • https://fotoprint.lv/downloads/file/rinijelevewajuxuvo.pdfIn PDF document text
    • http://lawngo.net/fckfiles/54756250996.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/movosi.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/65790773996.pdfIn PDF document text
    • http://air-ned.com/uploads/files/81619171181.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160745a088bb8e---29474658950.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/dewijudunadamuvab.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/86756736681.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/95723202531.pdfIn PDF document text
    • https://alohasafaris.com/files/sosawibiboraxevufisumi.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078625616e6e---50967075647.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/komikepexomamufirofupusi.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b36f81495---powigikodezonavasiduk.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3e53c5c49---95564677130.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097e85ee2248---gumilakosador.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/22716318034.pdfIn PDF document text
    • http://calebdobe.com/clients/875189/File/sunukulilevozajufetevu.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c2993abc4ed---simadupukizi.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///39845877745.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f3f8ebf18---11489497549.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/mezutofakus.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/zolovazikusaxaraf.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/98143942178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=html+colors+chart+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_off0000c890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC890 17444 bytes
SHA-256: 84ed76030671627d695da86b00c36c922bca36abc8d927642de03692363d92af
font_01_sfnt_off0000f5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E0 10548 bytes
SHA-256: a0bd8d896b20601dc263ca7c1228582e729e90dbf73d06b643321001dcd3d337
font_02_sfnt_off00010de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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