Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e6918e5b7aa94d…

MALICIOUS

PDF

82.1 KB Created: 2021-09-23 19:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 247f3cb53c84ac1bbd5be89cf74e22b1 SHA-1: 2fba160de6c8ffdab7aa0ebfb8bbec32cb3f5a7e SHA-256: f4e6918e5b7aa94d786d079fd61a953b0ffaa5f7bcb5d2a8310a1ab3c38961a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites 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 content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=domi+radio+app+download PDF link annotation
    • http://lblussana.it/images/file/totibadenexurujit.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/87ff890b1f9982d71ce6e29ec3644dbe/80898228195.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/46523418162.pdfIn PDF document text
    • http://xfswchem.com/upload/files/mebaximunaf.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/86901695388.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/26552507692.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af8f47021b---jolodolizeverikuxulo.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/13227399948.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/7322329052.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/54158675486.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/fitebiwili.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/f8c507ec6c72ec74fbdb44bf473503f0/52012446399.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/35566973259.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cf170a8701629542dfb82f12be5c4255/jatowubilo.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/wimibi.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/lelonativaturubaz.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/72e7177bbb4c887d902dc38b5f369355/fopaxev.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/28936380950.pdfIn PDF document text
    • http://momsystem.ru/public/file/68953815660.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/69880889268.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f42912736---pumewaxexapopaxibiki.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/58154933304.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/mevazodivodovodix.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/40400560580.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16143fa0755530---rasadodelil.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/83701116956.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_off0000dc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42F 18112 bytes
SHA-256: d7618936887e8fa03d2cefde8653f7d178d50de1da2f74cd29f4cac8a90013e8
font_02_sfnt_off00012396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12396 10240 bytes
SHA-256: 5d64c4823148a99aa4a8dec99822a0e98c20297c61ab55e92595b783914e74cd

Open this report in the interactive analyzer, or submit your own file for analysis.