Malicious PDF — malware analysis report

Static analysis result for SHA-256 8726113fa9815727…

MALICIOUS

PDF

101.9 KB Created: 2021-07-13 00:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 24029d5ddbb16f8c4b042e31a472eb94 SHA-1: 767c6e1a3bc4adbe6ebbb5076ec0bae22ecb71ed SHA-256: 8726113fa9815727a0fdc77e782136c474c452cc7b95e32114703511ea741b1a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan variant. The document contains numerous links pointing to compromised WordPress upload directories, suggesting a tactic to host malicious files or redirect users to phishing sites. The presence of multiple distinct hosts and a link farm pattern indicates a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://oniceh.ru/uplcv?utm_term=simple+myself+for+interview PDF link annotation
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a27b2698fc9---nulilaveruluzuzako.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946f31c58e8---dododus.pdfIn PDF document text
    • http://abwva.com/uploads/files/42999138768.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ebb7a16a34a370204dc47e16b11e38c2/26765516963.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaecb21e12---45947215902.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/11673045913.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/lujuputegawinirepo.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2438315cf---14103116956.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/minupuwujojig.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/gixok.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b29a5fb8238---97665038729.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/319029796.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/85893561563.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d538a2c63b---nivewinozerekoji.pdfIn PDF document text
    • http://infunplastic.com/d/files/pegemanakak.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/wobetikelulidedaku.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/3cb1d1839ae106d550b2fd424650531e/bosifapo.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a81ee77982---59689517589.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/rj5c0nlde6i1dncsv2026vvcv5/dowelusujuvataf.pdfIn PDF document text
    • https://carlojans.com/cms/file/18926351571.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/61e43402ebb4cee7481f19aaa63bf5bf/16310678683.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/boept1rkl9pc9g7i03sv82cqk4/mapufodatomaretokupor.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/pefabafiv.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88d932b6e---86893501619.pdfIn PDF document text
    • http://abnicum.com/files/file/surefunirirejim.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_off00012abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABF 17848 bytes
SHA-256: 538bb529169a46c6bde8c0ad736dd8bf78561df1ffb7a7da33df336df920c2b7
font_01_sfnt_off000159a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000171b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171B9 10696 bytes
SHA-256: c694f7bcf6856deb7cefd97e8db83bc209bb4335367ee130c3d5f18decae972a