Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc6c369fe1eed38…

MALICIOUS

PDF

86.1 KB Created: 2021-09-06 05:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fdd14a2d2846b27664572e0c239dadc8 SHA-1: 6c1227516af61f11c20fee659653372ef2c8a0ab SHA-256: 5fc6c369fe1eed38493d3e62008fc358fdc8f4838312f7d3a9978b32ac776eb4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the PDF is part of a link farm hosted on compromised WordPress sites, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • 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://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/33b74db4242e4273fcf432ef1816c3f8/31961330279.pdf In PDF document text
    • http://magogaralbamoble.com/galeria/files/50036914587.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a79374d510111e0b5be36c6f5533d8bb/badazoxuseditegemi.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/33009773263.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/11448388582.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca8267b0e---xuxupuwabupusanipixe.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/1098765289.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/nlt8k1dnuv7mnfq1hs9o8gh34g/leboxupefawi.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f148a6b98a---nipojasowu.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/35047990909.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/hcd998p7fvhs8ad4plvbuofpk5/zerofika.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/71197030482.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/61323e732bb2dc831a12e6aede343db4/7128920140.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/dd8baba1525e48142d6876ca5510ccb5/wuzasaki.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092547414330---44813025096.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/lofewo.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/rutiwuboleji.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/nagufebodixotafa.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/tezamiludixuguvilokokuvu.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160986fe90c64c---87876176213.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f077f10fe90---jonimebos.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210610_52F782C2126D0984.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df5c8e2e48f---42051678629.pdfIn PDF document text
    • https://hsse.cl/files/lizarilorabijor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ryzen+3700x+manual+overclockPDF 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_off0000ee77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10689 16540 bytes
SHA-256: 3ff6228762329341f09742f9dec8e7320b31fe0ef431526b955d333b125127ee
font_02_sfnt_off0001318e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318E 10956 bytes
SHA-256: ce59bc98ba003be80485a34f9215ee49f0d65e269626385781125dc32b49cd21

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