Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f993ec01876e89b…

MALICIOUS

PDF

84.6 KB Created: 2021-07-09 18:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0f16826444a9e3fd3d0e75724216a7a4 SHA-1: 7571c49f68017add2e1e5ef9e89f7f1a6f5af10e SHA-256: 3f993ec01876e89bf401bcd9ee1ae1f7cb16f13e32ab243bd2d70a29b0ab16f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model with high confidence. It contains numerous links to websites hosted on compromised WordPress installations, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to exploit users through phishing or by serving a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8be25644c---mofakiwixazesefelumu.pdf In PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160759b87988bc---38836130181.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb0375e925---88576315657.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/405f1f6bff0ce0ee77b827f59caaee74/92223913905.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/kuvutotugidaramugada.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/31155853847.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/7dcafa6ed88ba83505d9b96cecb9379b/lidine.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/bavasufajir.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e87e8f0f22---jonaven.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa066a44fbb---nujaxexewoguvesinewud.pdfIn PDF document text
    • http://ladue69.com/clients/876446/File/tidanokakaxisafuxit.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/83272686436.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/4vm50pijj5qf2u0g36302iff01/18997212888.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/672dd18vig8h5guvpci7sodk8k/pisupejimutarumujuzaseg.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/17974126446.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b74bc39732---korunoduxibar.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/3705951889.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b81ff9db2b---jufifinovovewe.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7ce84d71f---wasepuxikudodusakopogonas.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607200da09765---wuxerora.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/sevuremerapena.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/c6dce914bf9d3ad8588b2acadf966818/37557827745.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a2f949b4481---32922637427.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/7q62o45q8e0csmhjnn7eeef3m6/wesemegixiwuwesewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=wan+topology+in+computer+networkPDF 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_off0000e899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE899 16624 bytes
SHA-256: 649006320bd1d57e979928084a876640575ab7fc7638f80b1648a1a1d7dbe02d
font_01_sfnt_off000113b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC7 10932 bytes
SHA-256: d373a5efb50f164a06a6b143e9d153e8f7642c7a8bf9560f1418ca36a6858eba

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