Malicious PDF — malware analysis report

Static analysis result for SHA-256 859c8a33ce21f6d2…

MALICIOUS

PDF

89.1 KB Created: 2021-09-07 20:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ccdc772a03218ebc2f9d15c24f40f5f1 SHA-1: a0b199343994c48ff384389acd1b720fc6d3e5d9 SHA-256: 859c8a33ce21f6d2ed87cb9e3d6ee2030580cf0824d97e30592c8682f7ce66f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba8c2bfb7d.pdf In PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/186d3297f4c63bab3314070c6ccef1c7/83882909378.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/suluwasu.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/14230216517.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/evsboeeqmh8c8t3bo61b2kej6r/78164601584.pdfIn PDF document text
    • https://moolans.com/uploads/files/fogukisixipalavovukutofeb.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1545b06b6---19105302533.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/bobazefi.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/dinekewumevijetakewowogo.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160de23d7e6c75---domuxaxajenuvixefe.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/litovobav.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/20e31ede8a99551c7f32c37a9ddf99a4/bisepedaj.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/gulanukoxibuv.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/42316908028.pdfIn PDF document text
    • http://deborahbrown.us/clients/860103/File/pazokufazeporeselilul.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b19c6f2cceb---lesiwevinunojipuda.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1611273e9c5a51---12408857201.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cecde6a9e5---rapor.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/430635e21f14b8138111df67191968b0/25567840808.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/527e39e2faba3aa02e794416c4504f62/16213740310.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/7a468992e4084a7b16a9313367977dce/14088561922.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/68550310501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=problemas+de+proporcionalidad+2+eso+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_off0000f1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C5 10944 bytes
SHA-256: 5de63b1a345b20091de1882bc4fef000ea5713f23e855ee59b7981102c9b329e
font_01_sfnt_off00010ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADE 20388 bytes
SHA-256: 9d1d2d18aa1110ddde91d4d4ccbd1aa06fdc677c99b7f4db49847931cbc98e75
font_02_sfnt_off00013ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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