Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff650d43be32c00b…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 11:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c42192b931eeccd871fc7353e7c1a150 SHA-1: 54cb37a3f263d85a95dcdabc33ae253f262a510f SHA-256: ff650d43be32c00b2b581d06ca1b4482cbe2172a29dbaecb29ae4c127acd8b31
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and numerous external links suggest an attempt to lead users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://profipreklady.cz/www/ckfinder/userfiles/files/jifafuk.pdf In PDF document text
    • http://lacasedescaraibes.fr/file/ninepabumo.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610ecb8d013ce---62752906918.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/fajefofifakokobovamil.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16093ebe69f7a6---11879375973.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/84806704017.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/muvopiliwuwisames.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80b04a5f20---21202141761.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/pirizoxajafigipane.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/83880143571.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a90d3d6f8---dotupef.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8c5f38532076bceb69ffa3a1e92a07c2/40831873225.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789070f109a---pegagobopanutoparinineti.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/17937502966.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/27834b834d4de8196bec19a635acf21c/boxitibob.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/1bc2f978eb1fd48cc331ff3c30a5fccf/jenugu.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/7604262249.pdfIn PDF document text
    • http://fteq.ru/files/file/ziwusijemefur.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///tepusuzidowu.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/31771448751.pdfIn PDF document text
    • http://bio86.fr/fichiers/2797182517.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/6b4a0cb8bebed62267ebb67da42cb049/tadetajudew.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/39551161661.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/latoximesanepabegutareba.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/30511124173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=herramientas+del+coaching+personal+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_off0000de74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE74 11056 bytes
SHA-256: a5f85606e90af2127d43c2dc129abfa4b3a5ab92dfacf3bfad038a95f36d42fc
font_01_sfnt_off0000f7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B8 18596 bytes
SHA-256: 2b78e5dc330829b09f91256dffdff33cfad8132f79d41cdad26b6a8168bce168
font_02_sfnt_off0001278c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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