Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9f4fa8870b5c6f…

MALICIOUS

PDF

78.3 KB Created: 2021-09-17 04:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4316c6feccfb24943c78425ccdbd70e1 SHA-1: 0bea816b78115c631f512b42199241539b67abe0 SHA-256: da9f4fa8870b5c6ff720d3f1ba0664ccea13786b628fb337aaa98b545c5c66fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, including one hosted on compromised WordPress upload storage, suggesting an attempt to obscure the final destination or leverage compromised infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://expertsystemgroup.com/file_media/file_image/file/16491381514.pdf In PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/81968849972.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/damojisarugare.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141f46ca1806---41314735878.pdfIn PDF document text
    • https://path.mn/userfiles/files/57815371811.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/sopikinosadelumado.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/tulixoxid.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161423d65363cb---bofimamejulusel.pdfIn PDF document text
    • https://tmtteks.com/files/33252554028.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/22765024728.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/79503436859.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/lafujejafipatewabuder.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/48653694487.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/8306767325.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/31213027639.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613879b8959e0---kenenomowarabajadojurir.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/48916783861.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136e79b9f68a---tedovilabisewu.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/foseguxuxepadevaxuf.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/bomowebajunemirope.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0c14ce987---95084143368.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/xotowusod.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/tulefepiguxekogesazero.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/95167250849.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/jugukineka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=last+week+tonight+free+onlinePDF 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_off0000cd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD34 17712 bytes
SHA-256: 4193976749b245f1048205f344dce7430c35290488448bef77109010dad98fda
font_01_sfnt_off0000fb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB50 10628 bytes
SHA-256: 382ef3cae81a8c9cb9151081569dada61fa2cc977bdf987790ef7bd9bfe60699
font_02_sfnt_off000113ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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