Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fec4e85eb735b82…

MALICIOUS

PDF

84.6 KB Created: 2021-07-30 05:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f80b67ac17235c95195b1fc896b621b3 SHA-1: 2fe384432103c247be0ec4da645ec4046e34b0bf SHA-256: 3fec4e85eb735b823686ff8919217c59dce663adb5f1009c03ac2bd14af5076e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://nomylo.ru/uplcv?utm_term=features+of+a+news+report+year+6 PDF link annotation
    • https://celebicatering.com/upload/ckfinder/files/jasixarumifemodege.pdfIn PDF document text
    • http://airsoft1.ro/files/file/wojetaloferi.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/21315678091.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/vesid.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c153812aab1---60574180652.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/36508020453.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/33607068346.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/wumoxuxapuwise.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/11617384470.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/6d2577cfff8c8e50970016aa4ec6bc88/kemufudoberulenugib.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160802f44b8255---14386938607.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0fed5fb24---14762910238.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c57bca1d440---xosesasarexonuditoli.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da68f28424---lebudinunodagosenexujubi.pdfIn PDF document text
    • http://ipublicity.cz/data/file/36865449362.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/c91c2649ac99515b17ebc911e8094083/59510490180.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/44281336445.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/xanegofipujopajadewa.pdfIn PDF document text
    • https://besteva.com/upload/files/xijan.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606de63d82509---26585448399.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/61181283539.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/7cf4434a834397d6ce7c35f060f3b991/wodedosedadezimulik.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/67192289496.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_off0000e716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE716 10660 bytes
SHA-256: d83b4e7899c77e6b8c8894ca1af19c409026c752b6159ba60bb8e6daa0514da3
font_01_sfnt_off0000ffc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D7 16880 bytes
SHA-256: ede3c5aa0c1827abb92059c1d9a3afbc52db5ecc0e2626212f55df93789eaf10

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