Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f420902167e239…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 16:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f5964c184992a5710d28b0ea8d6af25 SHA-1: 14fb4669707ec598450ea446e7259d2ba1bef869 SHA-256: 64f420902167e2390783b2eda150ac0cfaa713452b8d48bdc4d57da596a694cf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. The document's structure as a link farm, combined with the use of compromised CMS upload storage, points to an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=2019+government+holidays+in+tamilnadu+pdf+in+tamil PDF link annotation
    • https://eprobatdz.com/ckfinder/userfiles/files/47222997324.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/1561cd310b8ed312c19f67a05142f412/19615624845.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af032fd4f8c---migeravalug.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/19pb9293hued73g0ljvp0v9mrp/tivoteb.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/11221658081.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/14453361489.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/juzukomibofeliwesegesa.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/mepov.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/egqjj6pnvhl5qav175laa88c80/79465545111.pdfIn PDF document text
    • http://apicn.net/upload/files/xavodudedukilujubekabema.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0b98507b244e83cb13b8a96d14c58e0f/vilasofa.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/60186978920.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161008369df7d0---26011234785.pdfIn PDF document text
    • https://qkon.ca/images/file/84445005924.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d625ebd75---91082178912.pdfIn PDF document text
    • https://4appsoftware.it/file/28070955891.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/83632995424.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/85120368902.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/36933022178.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/cc65c7f843c218b48d88e3d9d83ba965/92176238685.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c162c6bdfe8---20251909876.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/21700905555.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/35f308cd6a5b81765caff637c9f83939/pevewunow.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/7c0762b5925fa4e7bcb370419a3811fd/68887060471.pdfIn 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://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_off0000e015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 17476 bytes
SHA-256: a552028f029f060d014fd97478836c354b3ad845a504c9cf5c1d424b9e97abd7
font_02_sfnt_off00012538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12538 11592 bytes
SHA-256: cbea01874eb93fbd2aee55bcac221d8b758e06b0ab2c64a681bb03c5cd174c5b

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