Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e8b3121a5554b4a…

MALICIOUS

PDF

102.2 KB Created: 2021-07-13 17:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4f8c297a03b7b8edc1221bd0d92dbb9b SHA-1: 33091af2327d1e9d6fe0065d4b0c44bd9545eb0e SHA-256: 1e8b3121a5554b4a54fe1b56f7d5de0e2ad39c57b2658f4fa0c009301ea82b47
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting it's part of a phishing or malware distribution scheme. The 'SE_INVOICE_LURE' heuristic indicates the document's content is designed to deceive the user into taking an action, likely related to payment or an invoice.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9682

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/v7ejh9psbt6u0cha2ml93f2h9q/38234651167.pdf In PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4e03e11ac---89687811802.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/53371495836.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160746b3ca8a68---vetelonusasugifisu.pdfIn PDF document text
    • http://0930actress.com/files/files/57866975080.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/7722b4d8cb4c30e12cc45faccc16edbd/fatojulekeludujuno.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/0c616ffc27d8a00f41aeaa8899fdb3ce/35531734098.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/56225986446.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d573b28b02---93577317980.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/b1f77891004c01b9a3535e8295ffbf01/93037673421.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/16927184393.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e34e6b3e7---10704987219.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7752e2d944---38102572132.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b5bb3706e---820680336.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/59592130829.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cccb27b29eb---folifixono.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a187201e39b---70975222104.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073fc8f320bb---71458445679.pdfIn PDF document text
    • https://istihdamhaberleri.com/upload/ckfinder/files/pakasapegalovasizu.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/34760298930.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/21301319291.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/vinupukikifaxumipe.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/logewis.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608333123fbf9---64470618988.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/99503095301.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/xexipirijirepexito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+book+of+the+sun+of+gnosis+pdf+englishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00011157.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11157 17756 bytes
SHA-256: 498d0a286fe83824d8f03adb854620e5580ad85dde91af081452f40c71a8d74e
font_01_sfnt_off00012cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCA 17472 bytes
SHA-256: 94fb03e0c5c7ba57a16ac061522e559aa506c256beb1c3f6c5be36c7e27adf06
font_02_sfnt_off00015a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A60 10812 bytes
SHA-256: ea949bdc18d7e5e574f75a3d4baf11f50da9cbe47699d5c36cb2951a6a37e7c2
font_03_sfnt_off000172d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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