Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4477e2467c94aec…

MALICIOUS

PDF

75.1 KB Created: 2021-09-18 17:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f4a2e1209d96dee4750ab20be2a03d03 SHA-1: 398c77326e91591a02cce8653e665d43847e0dbd SHA-256: f4477e2467c94aec4ad29912edab8300485422b0e391b88be23e479aec504d1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm with numerous URLs hosted on disposable or compromised domains, suggesting it is designed to redirect users to malicious content. The presence of external URIs and link farm heuristics points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=reface+app+android+download PDF link annotation
    • https://myparrotfood.com/user_files/files/xomuvurodasevetov.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/9531396543.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/susavi.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/fofal.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/t21kj8cg877k7cvf1qsmhr47bd/katefuta.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/lemepawokaj.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/68265803262.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/xudenera.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210916133533.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161447e269cb18---fafewotatozekano.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/43215772392.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133d25faaeb2---tazeno.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210908_25AE0FC0C9B4D5E1.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/46397665739.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/toxik.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/dadolevitu.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613933be796ef---xupogak.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/c07eb5b44407f4f084a9ca947c92e35a/37160878487.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/kibivunamim.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/rimebijafejipeverarij.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/21291792766.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/74381013446.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/90886102808.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_off0000c186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC186 17560 bytes
SHA-256: d288d62ec92743d06b082420bc80a33fb2d6738b4065c7a35288e801df469f52
font_01_sfnt_off0000ef1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1E 10476 bytes
SHA-256: 42bbec969317b335a1cf3b54b38be8ec7232d675c9de215a515471f8007b00ae
font_02_sfnt_off0001070d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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