Malicious PDF — malware analysis report

Static analysis result for SHA-256 76824c0ef7d237e4…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 16:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 93e7ab0903cae98f9214c6ee701c7efc SHA-1: 69a4ef3b0bac950a3537e7c886bc098b5389e1f3 SHA-256: 76824c0ef7d237e411b9f47b7cbf0f69dcb899771d4f61eadf5d41043195ab7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to disposable hosting or compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm and compromised CMS uploads points towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://kmbb.at/userfiles/file/mewaguke.pdf In PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16141f01c2d2a4---lofasibekivamitorutesu.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/8285704283.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/rilidawoletifejotatasi.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/ginit.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///viwediduvupebezofujomini.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/wuzufosu.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/78298007075.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/95188678645.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613832571d907---lobegiz.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-11/images/files/zegujovefogaretirifejofoz.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/tidelexidazonesekubibebu.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142bdbfb77f3---lunuzowamaposu.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/nizuwavevedimepalujosesa.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/7883421469.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f718125c4e---visamofefelibodomodofimi.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfa5e127a9---lulizuvuxotadivitobisum.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/43227700269.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/13kd95q8ut9lmr0j2vhn1ng285/57743234338.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/gumatenuzaxozilinemur.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/malibukenuxizat.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/poxusoz.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/50386193246.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/7afda4fea78db543f5c1b33f3233addf/rafabiralorosuviligatik.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/47678821863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=download+live+wallpapers+for+pc+windows+10PDF 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_off0000d909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD909 16976 bytes
SHA-256: a35405c1a3ea38e53c5c9b4bcb12f0c09baf9d05c8da02bdba7ac40c60be0971
font_01_sfnt_off0001053a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D51 10840 bytes
SHA-256: 9154e5a089b15a7cbb93bbb601443292918abe452f0d12d97b2542c5b1fa9bd8

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