Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be1ba4366d9d1e0…

MALICIOUS

PDF

78.7 KB Created: 2021-08-11 15:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d667ec7dcad63f2db7fd0197ae870c39 SHA-1: 9996cf1d990c77a98bbd47618db7166a2d6c8022 SHA-256: 9be1ba4366d9d1e04897951775bcd4fcb671e556ee57087c45af0deebc625dec
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nestaerospace.com/uploads/file/tuliperitekajabozoru.pdf In PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/vozixikizujufi.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160747363032d6---biwanilevivapulotedonam.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/2e00dbcd0ba6ad5dd798d0b87aea00bf/66855737079.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e64a60ce440---51738023967.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/pipujalivabasovifuwujanaj.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/divofebinidawevot.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609e82f86b9c7---bonuligajimubuzufexodusot.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/6124306272.pdfIn PDF document text
    • https://parkettworld.com/upload/files/48425533750.pdfIn PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/76270517294.pdfIn PDF document text
    • http://lucann.com/Upload/file/xogalodusevasagosupuniva.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/23551269137.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bc99530d0---75321270838.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/6af37735b7860d7e1493fcf6e776c906/28165513725.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/ronexarokuxuloriwog.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/2254971779.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084056a87617---bugutaj.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/51147241865.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/8a032e0cbc43b992efa05428a5fe3ec6/foxowoxeketigozelo.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/1620197808.pdfIn PDF document text
    • http://mramus.com/fck/imagesfile/zariferuzisaxusafoti.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089427943eea---69309193168.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/tuzawukiwesijamat.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/62328779732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=algebra+1+worksheets+with+answers+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_off0000ce89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE89 11128 bytes
SHA-256: 776a4ad54cf97680e6220e87902c411dca1e910ed673a2337e72785c6b7a69a1
font_01_sfnt_off0000e821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE821 17276 bytes
SHA-256: 7afbce20d2adb0ad7f5b324d4fa74670949a70c6beb0e6bf92b83ef70039d8bd
font_02_sfnt_off00011558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1