Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5e7f697e0d880b…

MALICIOUS

PDF

86.7 KB Created: 2021-09-18 18:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 462173e26210e7781f3bd41102f0174b SHA-1: 8a86b3a85033b89480b420559688ac5685ccec6e SHA-256: 3b5e7f697e0d880b1b233d6bfb4566ff4ec12c3192c4fffe7250b001e070b22a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of 'utm_term' parameters suggests tracking or redirection for malicious campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://nomylo.ru/uplcv?utm_term=vr+porn+app+android PDF link annotation
    • http://ippon.lv/uploads/File/takowasogugufisuveja.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/xagapixubalaxegix.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/zogufetofinimirud.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/82708263279.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/54453728541.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c55b06c69---mepekojapabol.pdfIn PDF document text
    • https://tch.lu/files/files/72747132265.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/3quluvoitrb1d19fjttd9b9g14/bakebubiketizudibuk.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/luwosodujidib.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/85153147302.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/54787310474.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdf0835f18---gegizugiwotowitota.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/vutarefife.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/vijetamu.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161357ba18efed---jameva.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/80342038382.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/18780900364.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/45157793221.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210909215812.pdfIn PDF document text
    • https://nepalfinepashmina.com/userfiles/file/41059934068.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/sufixuzila.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/18063992210.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/juwadibimotoverexur.pdfIn PDF document text
    • https://loyd.rs/images/file/xafepubosorab.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/6495100475.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/60121592583.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_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 18296 bytes
SHA-256: 6c104cf58d0adb10fcb0192ef19c89199e77d67780634ca7200b984500310242
font_01_sfnt_off00011f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13728 9912 bytes
SHA-256: 9f8baf51120d87f598dba3ca56047789845f87c55ff873215c166593d0c64848

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