Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f8b247037cdb0a…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 10:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa544dd73b8ea8be3965efd9b32f2b88 SHA-1: 1a8e319388444d4195186edba87df7d0da49eddc SHA-256: f4f8b247037cdb0a207147ea73072befc8e92d2b4d0d72ea503e702b63c0b527
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised WordPress upload directories. The presence of these links suggests an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://www.radanhorse.com/resource/files/85146827305.pdf In PDF document text
    • https://augsburger-dartliga.de/uploads/file/15368393631.pdfIn PDF document text
    • https://tpk-m.ru/files/file/pexop.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/difikeferu.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/a124cfdc3428305d0347a69d7a48acad/45216685245.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/82227063649.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/22605616001.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/27063008912.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7e4581eca---93887460733.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613084f194082---52430734023.pdfIn PDF document text
    • http://recrute.fr/files/files/38892016107.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/74058143821.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/a2b00f4b2544b80a28c27d4afb3f5b72/dazenilifuzodufes.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630531314.pdfIn PDF document text
    • https://artenika.pl/fck/file/39907857706.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/19363617188.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/bawekul.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/gepure.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac4cb61212---puxijidefew.pdfIn PDF document text
    • http://synhbio.com/upload/files/jovinaxadevakusofu.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/86618465498.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/dacd9a2cfc641a48510b856b472625be/67117755571.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/puxofojolowini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=screenshot+gesture+appPDF 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_off0000d509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD509 18452 bytes
SHA-256: 19b04ab355e0d2ceaaef7c7773682c9e2ec58f9d619a30288e53bb7d8ebdcc1b
font_01_sfnt_off0001057b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057B 10688 bytes
SHA-256: 845e1b180c34941ca282ce34d55d80f7ccbbdc5802e3d8fb8ebc587bf97002bd
font_02_sfnt_off00011df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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