Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e5298f17f3ec62…

MALICIOUS

PDF

89.4 KB Created: 2021-07-24 03:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b5078b73e62d34508e84cc95a8d443b9 SHA-1: a4bc441c8363c089ce8386c5351abc535e6f5fad SHA-256: 45e5298f17f3ec626c9e505b36c3cbc48aeb3b08fbfe0ab66521b22294a14854
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b89e105a44a---13164133673.pdf In PDF document text
    • http://gocep.org/data/userfiles/files/3138666273.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021070213213873499.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/2d97ba81524fa93e61691d225977752d/78572392237.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/gegazuragosutiravit.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084bbac46264---namib.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/58610118208.pdfIn PDF document text
    • http://specimport.by/files/files/xazukunikegoris.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ve64ef4ltsik33n8e9bkqu6md3/gipomapurava.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/8rcn8vme49sf112lms45mkciqq/73505423148.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/xerakekasixoke.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/beminubufage.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/00f67a2a9732eca7af918edbccca829a/58459514286.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/sifemekulifuvop.pdfIn PDF document text
    • http://dentherapia.hu/files/file/titegutilefim.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ea4a4e9491fb387d3abb03aa2a51a4c7/30070800393.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/d88f7d83cf41ec28b35a051955e93d5d/56078266438.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/74484825546.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/satofepalatesimagu.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/kvor8jdistg0jp788iihihoum3/42125434691.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/fomijadorujarejigikifo.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18d8222af8---pekixixonivelafimos.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/48916154280.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bee8f2d6c9d---26359728709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=does+porsche+macan+have+remote+startPDF 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_off0000f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 10568 bytes
SHA-256: 608ab73bb22a9a34f5dc428b71115ad045aee0d263db266256a7e7655c60c236
font_01_sfnt_off00010ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001280f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280F 17628 bytes
SHA-256: 0433ff91c36c1bb9b25e62db9939377764331d644d3e7854243cfa5643da0978