Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b1683f87bb1467…

MALICIOUS

PDF

77.0 KB Created: 2021-08-08 09:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: be8ceb5e1f9e78fd59e41b0ddc1cb6c5 SHA-1: 0c3858e4e3f976d06536e232340eb5f142f5e56e SHA-256: d6b1683f87bb14670565c5018e30050da17a18119b6b51ccbdb24adee4806995
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://yaslibakicisi.net/userfiles/file/64715559229.pdf In PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/jiwinaribewobazekakedere.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/87qfha1f58oq1kk5gike56724q/56626958785.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/45225630268.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084869bc9857---29478495907.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/wepexune.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/vofanunisutiwa.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/nivirut.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/mobul.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/bejalujazugulowijexomonon.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/gekanu.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/tosabewupofilumegavujomi.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/11949940968.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607886c02ad77---lukajiwebifoledalirala.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/30044628927.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608272d1ef64d---88763777592.pdfIn PDF document text
    • https://masihpt1.com/contents//files/54708899826.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/53904674934.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210603031146.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/97527805381.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6af2cda0aa---69691277726.pdfIn PDF document text
    • http://www.520amis.com/upload/files/5039817505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=relative+clauses+defining+and+non+defining+worksheetPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c48e716773---xubinirugitidajowamopapom.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_off0000c7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00B 16500 bytes
SHA-256: 65040735d9093500767fcf7abc228e294b7244f039b619754bbc3a711bc6943d
font_02_sfnt_off00010b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0B 11144 bytes
SHA-256: 9ce8a2693c25a6909675b629ed8465be7530ad5a0d0fc8d6a6d325031562e526