Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab59a8a948041a3…

MALICIOUS

PDF

82.3 KB Created: 2021-08-22 03:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef926364dab477d5b9bf6474843f7b3b SHA-1: 73e60262e926477a40e03f25c2c4c6d2747bf4d6 SHA-256: 8ab59a8a948041a30564bae7e0f9da29cecaed1fdc603910f45dba0f0ef15128
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs that point to compromised websites and link farms, suggesting an attempt to redirect users to malicious content or phishing pages. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://archism.ru/uplcv?utm_term=how+to+install+gta+v+zombie+mod PDF link annotation
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/0d968696a9ec8c98e925688ffb22b43c/pejexakodonovudore.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/44725045862.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/genejivebo.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/88813993577.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/77aed4eb2e70f57e74bc294b4078bee4/junajizuzipip.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/33034205168.pdfIn PDF document text
    • https://proxus.nl/file/mupofogevup.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2acc97c470---91726030302.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160737cbf8f72c---pitibuxodijako.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16070897b49db4---vigaje.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/30825605154.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/13944082428.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb9c5e184c---41267073226.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/df69b1fc4ba52916dcd7803dcac8b083/11904791254.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/30948551499.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/79ca77472e7c07844202764d246df4c4/latajovax.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a652ea7ea02---sutaxojuxul.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/91377642300.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/79118290722.pdfIn PDF document text
    • http://eksternest.be/images/file/mekigojitivosovo.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/jojusuxifixikepepez.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_off0000df6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6D 10836 bytes
SHA-256: 634b80f7c9c0fdedbc4aca72d48e9971e81bc280c5de80494546c35eb2235a00
font_01_sfnt_off0000f83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 16444 bytes
SHA-256: d89650beb4c9e19215cad8cdf4df968fa5f8140856f3c7d8cd21a207137285a2
font_02_sfnt_off000122de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1