Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c11ca8c8495c6d4…

MALICIOUS

PDF

87.9 KB Created: 2021-09-18 15:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4fbb2e5a7e659f5da05f05ae2c00b9ab SHA-1: b496bcfcc150dc5c643c9e557f9394763af21d5b SHA-256: 4c11ca8c8495c6d433c421496e20d77eb3fab32b095c9d602422b22c455df937
176 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of callback lure heuristics further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/joxesoxipitamegilovize.pdf In PDF document text
    • http://studioarchterreni.it/userfiles/files/25057645850.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614002d03e798---58236291864.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/df43e303cc9597924316190268d25fc6/19095348497.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/94741701897.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/76828605383.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/15694077150.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/43545373182.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/3782576837.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/82498559275.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/29425956606.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/40188013745.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613a707c246a9---11045746986.pdfIn PDF document text
    • http://katela.net/userData/board/file/86663454651.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/dekulisafutirib.pdfIn PDF document text
    • http://snft.ro/media/file/mafijafuxaluku.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210916_080A9263476B4742.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c432f5547d---winukiludesoxegulibiwokib.pdfIn PDF document text
    • http://ministerium.pt/files/fipenif.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/gu5sk4g2k1ft40g1paat4i5d36/99212000675.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/97267848348.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/76993416935.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/56546056596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=breaking+bad+streaming+servicesPDF 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_off0000f0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A6 18316 bytes
SHA-256: 2eb14ea49aa0e88b4d153612df8b70fa9a6f49002485e6d641810df91a7abcb9
font_01_sfnt_off000120ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AD 10896 bytes
SHA-256: 471de648a5bc6bbd313a7cc6beb06e473649757f17952bce92f6219c3ca7167d
font_02_sfnt_off000139c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1