Malicious PDF — malware analysis report

Static analysis result for SHA-256 507fd379fe4eb702…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 09:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5f05b053cc564d0440dbf17a07faa6a0 SHA-1: eee01891d58f4c5e138c1e2c5851948763816250 SHA-256: 507fd379fe4eb702e9b17771615ebc8fc8c024ebc45531902d0e141433043df6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or other disposable hosting, suggesting a link farm designed to distribute traffic or host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cructi.ru/uplcv?utm_term=how+to+make+an+mp4+an+mp3 PDF link annotation
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/25993528807.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/fiwemowagojomoro.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/xirozi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c42cd2469f---nagebebefox.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/72536920314.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/75894805663.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/14061812161.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/wixuvulowewujigoviguvomax.pdfIn PDF document text
    • http://masonhn.com/d/files/ginapuxesozabij.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/56421770607.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/75590051341.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613854c9132b6---80930356002.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/27585976233.pdfIn PDF document text
    • http://tradotel-riviera.com/file/femagizumuxalig.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/2318249829.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jutopasafazirijologikelas.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/52353977812.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/fififeginonatowaroxegodop.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/balufutojarukarafi.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/ruwimafasijumefimuto.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/57536365171.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/553166a31c16198bdf0f08d6ccf51cf8/11811897515.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138b88992f18---jemalerelebunatonodivaj.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/32391729387.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_off0000e438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE438 10428 bytes
SHA-256: 57887a2885dbade4236b033c5f1e243c9792ae779dd8dc565585e8aa96336ba1
font_01_sfnt_off0000fbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDD 18356 bytes
SHA-256: 8faabc0e2840915f1e480ec20712ecdb5b40c1311e14651e72677125b0848fce
font_02_sfnt_off00012af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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