Malicious PDF — malware analysis report

Static analysis result for SHA-256 229b456de0a36a5f…

MALICIOUS

PDF

76.5 KB Created: 2021-08-13 01:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 871870b28dc482ed17fef4bdd93d4cba SHA-1: 8e1dfe981b545819dcefdb9c4cf5a310b34965cf SHA-256: 229b456de0a36a5fa60caaafcbe7cece348794d3a5d73f491d18b6bd4c04a7ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress uploads, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware delivery or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd776ad3d2---wixenemeluzelop.pdf In PDF document text
    • http://prmakeup.com/Image/files/27391231301.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894853788f9---rorugipiwe.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/legagumujejufabak.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621483639.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/54193423395.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/95406568556.pdfIn PDF document text
    • http://simpelms.nl/userfiles//files/11595079806.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///23904875644.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/f825dnn5g516153a8dh44leh09/56075574322.pdfIn PDF document text
    • http://alkanboya.com/files/file///85395978771.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd4fad1a1d---vowirumukukowebebu.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/mezikoxefigelivodigut.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/keausjsin174uo7ldh91m51uqj/30628805327.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/181916492541.pdfIn PDF document text
    • https://shopabrang.com/images/files/75907292632.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3cc07dccb---goxodivanuwazogudamulek.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/titaxuvekabisejefafas.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210718_124256_8732.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/38069237889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ejercicios+excel+2013+tablas+dinamicas+xlsPDF 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_off0000c572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC572 11352 bytes
SHA-256: 3e92f84b519c6ee649cc0aca8fbbd4cd621a52e22c4229eb3107218c93b39484
font_01_sfnt_off0000e036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE036 16680 bytes
SHA-256: 6ddb00ec0d9eb7b24a3a596600641cf09e3f1f89fb7e6dd99ed67bd8b721cfba
font_02_sfnt_off00010a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1