Malicious PDF — malware analysis report

Static analysis result for SHA-256 77559d078d7c2b8a…

MALICIOUS

PDF

90.8 KB Created: 2021-09-09 15:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d0652a2262cf16128f4efd04859129a0 SHA-1: d8e378e53be8987347ca820cb890f76357f631d6 SHA-256: 77559d078d7c2b8a4e276dbc09d3fa863e4fe80d8baa4ccad17bde39b9f2fa81
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress upload directories or disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate the redirection to phishing or malware distribution sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://studiotecnicolari.it/userfiles/files/33699541408.pdf In PDF document text
    • http://9275522-travel.com/userfiles/file/gamobarikuxivoxow.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/89572262746.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/11126491842.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd260f43c---panonivujusupak.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/nugazezufojuminurud.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/ximelakofora.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/zatinijobizo.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327c4ad8aed---37468717293.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/vewikajebafaderoko.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/vatogidola.pdfIn PDF document text
    • http://compsult.net/userfiles/file/14487641400.pdfIn PDF document text
    • http://datcat.vn/2018/file/4496713654.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138821b8bf6c---36766956132.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/75429338812.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613927c51fe26---tapenibutonadawiwa.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/foxikexepedifonituxijuf.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/86418634725.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/boteguwederorolaziwudi.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/28914516360.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/84405332866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=xbox+gift+card+codes+generator+2021PDF 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_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B1 11148 bytes
SHA-256: e004f9d8d18689aeec6b936842754fdb23a952a7617c5cce1305df2f1f95cc2b
font_02_sfnt_off00012ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCC 19032 bytes
SHA-256: 479d75b1315fa091306d77ccfca83988040dcc532352c7b2df68223cf38838c4