Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38398ea46ebc6c7…

MALICIOUS

PDF

86.2 KB Created: 2021-09-08 19:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bf5399cf753dd5e43c31d14176955634 SHA-1: e56bdee96792eed803dff1e869f3c0f12bdae565 SHA-256: c38398ea46ebc6c73146886ef9a19003abadbaf8235972b979b8dce3045fbb77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sintellect.ru/Repository/file/lunujelepixofewebixixe.pdf In PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/51814724436.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/takotozelitipiruduri.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/62502456783.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/22472374626.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/namexujosuwoti.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/madulofeligonosu.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/sugunazelidukodibog.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134fc4c0b3be---59873330274.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109061507166102.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613664d18b8d8---51578105604.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/bugariforo.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/15951275242.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/jaxugegevukotawipud.pdfIn PDF document text
    • http://parateam.cz/file/42496280396.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/47512803036.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130666f877b1---61285421587.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/bozapedoroderuweputage.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ce74c656ffc3364049fb752b320aa2c/20473041459.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef72f2e680---82362644409.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/fefirut.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/5238179351.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210901231716.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/10529164307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=vocabulaire+anglais+hotellerie+restauration+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_off0000e16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 21984 bytes
SHA-256: 01941aabb7c51bc060d0b26255190d5f0206ba2f603bca9f1b8ff9c9decc1f1a
font_01_sfnt_off000118c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E0 11108 bytes
SHA-256: ef367f70be18fc79a8a91ba70f1d91b4f8c61df3caefe7794ae82926923ed243

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