Malicious PDF — malware analysis report

Static analysis result for SHA-256 694fccdd244f4f6f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 14:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1257d0d779fdd6be624889e03f53b33c SHA-1: 1c09d101f7b06838bff8e2b0bde9e178219c3e0e SHA-256: 694fccdd244f4f6f596e1e2e1868761a4d61a1a7a339deb3ae69a44dfe63d517
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to leverage search engine optimization and compromised infrastructure to distribute malicious content. No scripts were extracted, but the overall structure and URL patterns strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/iaqcrs0uvjd9edtrua05n53kaa/14483863494.pdf In PDF document text
    • https://armagedonspedycja.pl/files/file/muxovibevu.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/zowejosusina.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/49706220583.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/99387736127.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/34355107761.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/93286799698.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/gibavinukikap.pdfIn PDF document text
    • https://bunianco.com/other_files/File/81796442609.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/lepabideto.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/kurapokisikuw.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/42250637460.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382a28694ee---83601397685.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/88055805746.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/39249757824.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-5/20210905102547819874.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/67693691505.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/13955281658.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/24319731986.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/36399128863.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161324eab34eb7---wafiwibiwukogowifo.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/c8151e034ad602fdd67937a89c8bf805/wofagulala.pdfIn PDF document text
    • https://digicpictures.com/downloads/61633462520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=online+magazine+pdf+templatesPDF 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_off0000db0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 16848 bytes
SHA-256: 92c9cf700e5821cf69437b482c0ee8850f510e85c35f7f2c025a8ced03070958
font_01_sfnt_off0001071e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071E 10708 bytes
SHA-256: 634ab951ca43cf7488614184ab6a08e0b12cd5922d11618781de76cb4fee989d
font_02_sfnt_off00011f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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