Malicious PDF — malware analysis report

Static analysis result for SHA-256 9861edfe241d03be…

MALICIOUS

PDF

88.3 KB Created: 2021-06-30 21:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 933eee9fd7efb1f09254a5b2d200af86 SHA-1: 55ceb704c43c05f90ff2abf7b54cd61c68286265 SHA-256: 9861edfe241d03be93130279cb351de3a08eca3c10f55b8e29edae0bd2101580
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farms indicates an attempt to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://huntic.ru/uplcv?utm_term=resting+heart+rate+84 PDF link annotation
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16094e042e0b99---tifurezukisevuzefajak.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4bea48732---bofigemezotuxetu.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/90745750604.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/94691216657.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/87091014326.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/60025ce395658352dd0abcd97ebf467d/xisolude.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcffe556bd---79067057630.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/6b5eb82f8389a27ca79d2e92711cc21e/zijuxub.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/c42lheoetsap1d7sb2ejkdak94/wofeveligetukesirej.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/08977cc318d3983097514952b3f5069a/lomabifeworoven.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/duzunixanifujufasevipoz.pdfIn PDF document text
    • http://gtshotel.it/images/file/pukudesexubowetolija.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/28017839771.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c63754718d---43560474449.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073b7f463e4e---dobununotugixasu.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/misasesulagebojetux.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/6b576838b208e30f20f225034b01b7c8/2871638266.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811b834cade---67297123980.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/77129249459.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833625bff8a.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/42772626613.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/4b0b99519aa39c12b6c4f842445469c4/99085384372.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/c42fbe29150f2cdf1919424bda690789/rebafofefazifunebirotinaz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f3c0e0219---sopijavava.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/k0hu1fhk6e0j8cmrgmro53thks/kokaribage.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/selovisagema.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_off0000f56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56A 17324 bytes
SHA-256: 15d9f22d9e3b44381a20bb0fa8ff6564725890b714e4305cc46094f242c6ad7a
font_01_sfnt_off0001228e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA5 10552 bytes
SHA-256: 8cf8602f466274c167ddc52e3b7b75ae45df128e31876e3396521b1c72107859