Malicious PDF — malware analysis report

Static analysis result for SHA-256 c07265a29502bf47…

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 04:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d98f87c44beddaf52d34b762c9fd8eb9 SHA-1: b0111a5a3382481a0d7e7724e5fa20e397af35c7 SHA-256: c07265a29502bf47dfca272d20aa9af3548ae08149e49d00a0769383e7a2d942
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145cc2aa4178---95511287212.pdf In PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/97864816409.pdfIn PDF document text
    • https://angkagenap.com/contents/files/12405422106.pdfIn PDF document text
    • https://egca.fr/userfiles/file/migizarudu.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/92078f4ee1f52d0ac9fa6c1b2023c9bb/51031309840.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/tirusewek.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/35011931425.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/69810318965.pdfIn PDF document text
    • https://maria-galland.ru/files/file/fobidataxovagitazetoz.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/17218487953.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/d7b78a5ac3cd447a9b90afa2e0537d51/movosabuguliwo.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210907222200.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/52870623825.pdfIn PDF document text
    • https://mimpishio.com/contents/files/22141319633.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/61719408348.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/65302984892.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/3visc02qciq2vsep2nhc946be2/marewokuvomur.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/uu038oubos661n5k6oorii27v4/rejagukezibudekodizikowuj.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/7336d5d33be33b7c17d073364e0f7751/78732466895.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/bakorudomijuvavobafiluni.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/seponarewasuxok.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/38753754693.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/zabamuwopafeli.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/743d8191b7e00a6ea78146c342f2fe82/14601311866.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/jasapita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+transfer+info+from+iphone+to+androidPDF 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_off0000d627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD627 10792 bytes
SHA-256: 45a05ab5f4b4cdc30afc0f00e9c01d78c8888ca5e8f1cbad57706ec17c7281b0
font_01_sfnt_off0000eed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED1 16932 bytes
SHA-256: 730e83f5881bb8a22c563dd3fa47347ad83c877e552e423607b736fc67237a32
font_02_sfnt_off00011a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1