Malicious PDF — malware analysis report

Static analysis result for SHA-256 37265980c09c78e8…

MALICIOUS

PDF

99.4 KB Created: 2021-06-25 18:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a3a96f08ff0751f02173d9d96ebc1627 SHA-1: 881809d6542472cdba8b6d239d4c3a11839ebf1c SHA-256: 37265980c09c78e8b58c326c203e444a43005ca39cb4e4a48f384a51fb0134e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, disguised as a Minecraft mods picture gallery. The embedded URLs suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/dddbf316108e0fc7bf3108526e319ec4/butafunonokejakanuguzusak.pdf In PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a391682ca46---vazarafafawawi.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/81604287059.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/bcgqmtna6ksbbbcukl2engi6p9/nakeduzilodumelirinor.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/687c359ea81f38e60988d2dd78cdfb77/8819798614.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/fmg2nss7akoc8s5r727qilajdi/vepivesaradulijo.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/49299885662.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b1faa3da1---71257412138.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5ec1d7309---60209046051.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/fopeboliwosavimulukasubun.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/60ea72001641121a317fe211473c16c9/finiwebelelowesajimigubo.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/82e2e1ba350072b5026462e1dd1539eb/sakofafezarimikovakozef.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608317666a53a---57082036803.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/15832963421.pdfIn PDF document text
    • http://aquatherm-graz.at/files/paweditumobo.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/vonutapenidupevefajapup.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/57179d61dadd480521dafc71c228ca1b/fuwerudozikogadawalo.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/5936b596c5ab101abf0558850eee1724/gijosofu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a9152953463---duxopunan.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608de4677da23---vepovokad.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ha3sa0ru8f9s58ha54b0e5t32j/lijoxif.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf661d3e124---modosef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=minecraft+mods+picturesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015f72.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15F72 18912 bytes
SHA-256: b3ac49a27e419f062e7eb0830915dc18946aed73528e894bdc38d4261b6db16d
font_00_sfnt_off0000ffc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DC 10828 bytes
SHA-256: 34cbe265303b998f96d5fb334c09860f09915300a7af1f487e4536cfe10a222e
font_02_sfnt_off000130d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D5 17752 bytes
SHA-256: 976847321b94610830915908e21095fbff65d4cdcd52b381d702349eccdf30fe

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