Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0bbfcb7046f541…

MALICIOUS

PDF

76.1 KB Created: 2021-06-07 20:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a6242f4b3f7021e8f29930e3520aee58 SHA-1: 0a55fc689b3ebe4cab17cb425876312ac0cc9848 SHA-256: ca0bbfcb7046f541b6ab889e361d37bd28dabb6d098d2b91cb50a19783688930
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://coretry.ru/uplcv?utm_term=que+significa+el+anillo+en+la+mano+derecha PDF link annotation
    • http://strandedtattoo.net/file/zefexutagal.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a5d94703267e231d5d6c6df51d4a0c5c/lekujulume.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/susuwusakifabat.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/sqkqb2f4m6ve4ei9bdg01i1qnd/kavupapafir.pdfIn PDF document text
    • https://vestol.bg/files/file/jisizuxarakitotinirajo.pdfIn PDF document text
    • http://allasclub.com/campannas/file/buvewobabadidumutonuru.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/01036dbb7a44da72a7d0802e1df4fc81/50933128102.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/23662984325.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a804ec43e26---gafoderafawasexiduvizad.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ci9ls89c77s5damnjm43goig06/fapavuvaxegesi.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/24809949658.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/jugetiwezajerurirafep.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f92321ee61---bubimotuzebaw.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/redojarularufasazulaferu.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33082223533.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/cfotmoj9r8aajpoi802it6rtqb/27821347714.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/9m7nm49u08p55r2vpa9l4mt39i/kujorojegurememesezusisi.pdfIn PDF document text
    • http://cjatkinson.com/userimages/50247168465.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5C 5300 bytes
SHA-256: f9d0e0ac80d81969b0ecdf90880a359a6770cc20908384b8dab5c2c7a9ab3b52
font_01_sfnt_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 11220 bytes
SHA-256: 2580eff787af66c47591d363d611cfe2cd994d71eb88257353908c233176e6a2
font_02_sfnt_off000112f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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