Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d771061e1765e07…

MALICIOUS

PDF

80.7 KB Created: 2021-09-11 21:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 44d084cf723e98699212cc222ee67719 SHA-1: 583ba6339b3ef3223b1ff01b98f4be90a6e9f42a SHA-256: 7d771061e1765e076535585d16c48b8b8706caba99f23dd93f8736ee7e5118eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing content. The presence of embedded JavaScript (T1059.007) further supports its malicious nature, likely for obfuscation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://amphorabeautyclub.com/campannas/file/69939193910.pdf In PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/77488780530.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/60550337918.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/986954391.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/lafapenunowutatoguzumat.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/76352285364.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/5604212836.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613510a173bb3---muxepiparovekujupoveji.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b17dc1ab1d---76175525633.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/rupewegamoxojafudijerizar.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/nimujule.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/68907516517.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/tikilabigodotulepob.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/13918468752.pdfIn PDF document text
    • http://becucci.it/userfiles/files/39497620624.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/90679261896.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/xikupameji.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/zisijotozudupapaso.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/taruwuba.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/1647143996.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/84388905454.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161345c705e3a4---6239814067.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16136476d564fe---jubetavedekun.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed86221f73---988209017.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/narikalefezuzeze.pdfIn PDF document text
    • http://balalajka.nu/media/gifaviwusuluf.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/89503279444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=schaum%27s+outline+analog+and+digital+communications+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_off0000d068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD068 11176 bytes
SHA-256: 3bb1fce5f169704ff000d9bfbeefe47cf5733479f84a20755c037400a8a00255
font_01_sfnt_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 19296 bytes
SHA-256: 92ed2ab7d5f45e2f12281e841b86ef6ddd3c72328666e1e5d69be2bbba90a761
font_02_sfnt_off00011cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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