Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c06da0a3a7248d…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 08:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5435ca42c72b069c63db3d33cc132f68 SHA-1: 9ebe3b9fd1559e1ba99e7afc279f2d730e0960b2 SHA-256: 59c06da0a3a7248d63ccef67540a7944f7b00b1e1a0ee2031ebd58b361ebe2ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript indicates an attempt to execute code, likely to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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 https://mexico-airport-transfers.com/ckfinder/userfiles/files/38292578411.pdf In PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe53436684---29658115296.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608067417274d---60385747547.pdfIn PDF document text
    • https://avvocatoboretti.com/file/7669488685.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202154647267076.pdfIn PDF document text
    • https://chpcentre.com/files/file/21884086600.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/42519419994.pdfIn PDF document text
    • https://baptistfriends.org/media/xoginewulunu.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/gp4qdv5p1hjs6bijr3ejgoldso/ludekofizinalawojugunotez.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/nedosi.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/lgae3ulfipo3e84tgt9kjuvvfe/folifuv.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160940731ed23c---zizival.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ff1ab22a---27281635082.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/ded766b77d5a131c9ede5a149bd6679e/fupek.pdfIn PDF document text
    • https://ms02bet.net/contents/files/20660280051.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/42548769434.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/0181cdb6f199b4f8fc6a61417f2660de/64318347908.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/niwuzanorujetifuxamojode.pdfIn PDF document text
    • http://headrepublic.pl/images/files/84633669665.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/datupikemuxupabojesovip.pdfIn PDF document text
    • http://boxethai38.com/upload/file/pexufililurimatifez.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210508213612.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/83297442278.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/tipupijovoxuruwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=wood+carving+techniques+pdfPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/19823606884.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_off0000ddb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB1 11160 bytes
SHA-256: f4a568b03da6e8d2d9e80b971ad9c509813933586c1ac332364f878551bffce7
font_01_sfnt_off0000f736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F48 16560 bytes
SHA-256: 77415eda35292f73ac1f51e0b07691ef5e8d02afd8837482022019eca30a7c76

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