Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6370c8c6ae7e75…

MALICIOUS

PDF

74.8 KB Created: 2021-09-06 21:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 893c0d542aecae237efcf3f6ef3221fb SHA-1: 0ebc51cd7e7a2368bd301e7b5e99a1f351e8d202 SHA-256: 6b6370c8c6ae7e753af77a1e1f190d9801a7db09bd9f00fdbb3aba084dc6906f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links, combined with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, indicates an attempt to direct users to potentially harmful external resources, possibly for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a610b6990d7---kutekidupojutetologu.pdf In PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9b234eff9---36926520258.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/kuvewifibafodusixulo.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/d0a6d0079374cb1da11c8c0aa55127a4/65584786280.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16120c1c107fea---varobakekenazoxu.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/95468413235.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/58974914857.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4ca312363---wetuzafew.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16090c15c27627---varakekelurakir.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee54c3a6d2---97546861136.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/837cc4112a6eee1c0b050b5d37cd7744/nedirutovemozoritufegut.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/xokiwakufozigejowu.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/3198206157.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/lodipo.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/radagagegen.pdfIn PDF document text
    • https://www.aeap.com.br/ckfinder/userfiles/files/kajoza.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/r2i793tat709sbgk9fra881sgk/jizigosojegamo.pdfIn PDF document text
    • http://funperm.ru/content/file/53277123693.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/e0f4mqufrp5f5o4uc9lpgf5bu6/nofisu.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae66cfa0990---77889217302.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/2ddad39eb685ea44f2d2034083c7199a/79626181202.pdfIn PDF document text
    • https://yuss.it/file/gufizivatetixinobanedema.pdfIn PDF document text
    • http://dd-eng.com/files/files/80746356253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=a+level+biology+revision+notes+pdf+ocrPDF 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_off0000c21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21D 10932 bytes
SHA-256: 50a31904a4e49c46f365786dac3a30015b51965e8b49288a6fedef23fbe3b62f
font_01_sfnt_off0000db31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 16204 bytes
SHA-256: afbb365423ba9a925833caa7738321230911f7d7b96ff8af311ef66e556a680a