Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6233f096b481b91…

MALICIOUS

PDF

70.7 KB Created: 2021-09-03 17:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a43060aa6cf2b81c87b49e377a83cdb0 SHA-1: 9e1515c7d01ef391a6816ec93a8d47372b040481 SHA-256: e6233f096b481b916d982cc5777834fd0bc44ecd4015decd78f7f894323099f5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF_IMAGE_LURE heuristic indicates it may present as an image to trick users into interacting with embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c31c010963a---mudabexazujopofe.pdf In PDF document text
    • http://vom-ragnaroek.de/uploads/file/92120360824.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9a9ea3ad8---fazefejomidapivudevudidol.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec23fe8233---rurukukozage.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/37774520069.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/80343311506.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16129dc62b6641---wasivevukofa.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2b53f294c07c0212d36cff9a30d4d99/fazerewavilu.pdfIn PDF document text
    • http://righetti1970.com/clients/872956/File/jawawu.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/teduserejotaxalelubamago.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/butiwuzigajipaw.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/risoxulenoderu.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/siduwagakuzujejazafaxol.pdfIn PDF document text
    • http://congtyvima.com/images/Download/sufuwupaninurijiji.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/78479115049.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0f9cb9727---posotosa.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/28151317326.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/mowap.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/60972809848.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/80671396527.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4772853603---tubugadixemo.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/relazimotixojusobatexijiw.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/5784b143f43d18a5a39365ee09e8d61e/49204765176.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/04356d161cd4edde213979ed41887aa8/xapojasufotogovuni.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/63361040820.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/luzaroxajasegobomusop.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b3d9be6b2---85822620808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=general+mathematics+workbook+pdfPDF 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_off0000b7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E9 14096 bytes
SHA-256: 0527b23ae7db0ef2fc9b2e1aa39df3ea7a6000cffca0c69fa2247940de953457
font_01_sfnt_off0000dac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DE 11240 bytes
SHA-256: cdf8681e5844727ba58907042fd56a51a6255c51cde88acac79da4fbf8dbc45f

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