Malicious PDF — malware analysis report

Static analysis result for SHA-256 33eb7f64c4baa3a3…

MALICIOUS

PDF

71.3 KB Created: 2021-09-01 01:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 933c6a3c6fb2cd5f685004994c903ab5 SHA-1: d14c0fbaf201cd456c3e5a11f08492f3a18b584c SHA-256: 33eb7f64c4baa3a3c73879df67a351ab553898837cb428cbc1e45eac9a7f1d73
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779072b8cf1---900143378.pdf In PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/7797358630.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/r74852srg612c1hhsblnntfdsd/nulokil.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb641b9de2---tokoxeja.pdfIn PDF document text
    • http://wdnederland.nl/file/fimajotagapenajefokigo.pdfIn PDF document text
    • http://midlandhigh79.com/clients/866549/File/55581612400.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/25697dvocs5g5fboev94kmcfm4/mijonepibozagelodopapu.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/wimuwikikalimejesosenono.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/34179716214.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/fifv23o4idnclf310jto2k4abj/wezoregujusebefafup.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/bemufekak.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/9676111713.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/latiwolokubinomokiroxuwop.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/52176687535.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bad1114fe3b---91962329462.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/82570640434.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/sizasefuzotumegobuzo.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae561613bb0---medalukagofofizi.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612badaf8273b---pusadusesugamol.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9146cc21f8---87396162790.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/42f0a221f0c5491397181ccb79149fbb/peliruka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+jump+manual+exercisesPDF 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_off0000b8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E4 15160 bytes
SHA-256: 8139d6443e5af07f3b64d36448cbe9f441b580ea935bb1631604e5beab62075d
font_01_sfnt_off0000df01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 10716 bytes
SHA-256: 6c839c7ee2508cbb2ba049576986773c4d7af5c64e5091ef2c4758bbe0e452f3
font_02_sfnt_off0000f758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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