Malicious PDF — malware analysis report

Static analysis result for SHA-256 df42eed2a4340323…

MALICIOUS

PDF

74.4 KB Created: 2021-09-05 03:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 424294715d87efdd5992cf1a048fd56c SHA-1: c38d258c6664dc99044a4f0eb221b596613e6a0b SHA-256: df42eed2a43403236899e7f494f5d1d9c76c653f035a6191c3b372c72298efbf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a large number of external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://millionsdiscount.com/mo_images/files/bonelatinazafajutapa.pdf In PDF document text
    • https://questyme.com/userfiles/file/5195539620.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1624358133940460949.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/67136230201.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/2e2c6f3139caa85cc52b5e5fd5c7a04b/nibodonerevejofafafadipa.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/9dh21im71rh2ebijfu8a1njb6h/bomewozujirivuperifizisu.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/20555936087.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/36994363915.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/11034139825.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5c0ccfa14a5e085490d5c02878cf7f39/43849512254.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/93403276371.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/1bfc1d2e5c4eaaa71e0a7a67f94ce209/11878593409.pdfIn PDF document text
    • http://expresskaliski.info/file/sewowofir.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/6de551d505e9ee6a523be1307b5eb572/91835711074.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/2546048452.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160da473e548bb---46324168861.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/jobimiwowisazodumetirez.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/tipibijizesogipajita.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d55d849be5---13605054300.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c725e3cc7a---kewamijaxevavagilu.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/58474365562.pdfIn PDF document text
    • http://dzbnf.com/upload/file///pusoxovo.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/97154216806.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/7140662391aa9c04a3510826bd8a05e4/tuxifikojekuzifumaliwuxi.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/fudujawitupobukarokitogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=linguagem+corporal+livro+pdf+gratisPDF 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_off0000bd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD33 11088 bytes
SHA-256: 573870a6ff2faab2d754a4acdb154a2ac7091b02cceba811942e20f9d0959aa0
font_01_sfnt_off0000d6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D7 17412 bytes
SHA-256: 7839d981123d95da3e7dcfd0fc7c9e8b6ed09426870db7169ef381fba102c9ea
font_02_sfnt_off000103a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1