Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf7a2fc3d439854…

MALICIOUS

PDF

70.0 KB Created: 2021-09-04 17:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45e4357d5e59d2565431232d39525018 SHA-1: d73c83061ca86fd24fd92998077b720dbee791af SHA-256: 6cf7a2fc3d439854619a2b1f07c71746dd665c66acdf6007f6fb4581ff90614b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to redirect users to malicious sites for phishing or malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://arniuniversity.in/ci/userfiles/files/ronuzivefiramomazetafofax.pdf In PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/6946495413.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/19859412495.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/dagijobobupovibavegu.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/tujidoguloruben.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9893f13400---29744255499.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/41098382228.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/jixapivawod.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/rudozufadesuv.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/pumavixabuxuzo.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/jkea0h0s250q2r51l3cnktkcl0/30649439149.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/sosovuzizaguka.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/mixamoxizesiko.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160990907d2577---31244679253.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46534357778.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/danafik.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/wanememivovexajip.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c02f549e686---jedukasufafiza.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/10791439827.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/19374369497.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/81991829181.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/desinupafidimazubejuguxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bose+revolve+plus+manual+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_off0000b130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB130 15804 bytes
SHA-256: 0aaa7688921d37325e10d2483eebcf5f3b499165ad0a80af91b9e41f874cc4d7
font_01_sfnt_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 10688 bytes
SHA-256: b8b351260da84b7dc74d3e13c57093c699562bf2af7fb91ee8b801c16b4f4daf

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