Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc5cc4113399bca…

MALICIOUS

PDF

79.4 KB Created: 2021-08-01 06:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16e83cec4fc0c13463e4d5aee10a4cfa SHA-1: 6d4b29995906c38944fd2d9cb292b73553e0c713 SHA-256: 9dc5cc4113399bca35f89025ce5eb837cd10b89719746c30520003dbfbe4c788
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ictn02ot082k3sd5r1lqfp5h95/85502314441.pdf In PDF document text
    • http://medica-brno.com/files/82081210711.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/30a0eee90ca698a137917cf9d1a755aa/lusat.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/kuwurajesine.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/70409583693.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/dpt7ahbsns26hihjqmbdiqd8vq/sizovuvagagevegoruf.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/9ivouo0kqi2baiffi432tnm3bg/fudewinopaleg.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/548b4508fb4281aa9edf5057ba81efbd/59237414988.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/zokepatugudaxu.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e0834ebbc---mawaxezasubiwo.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/5d05bc236efc9e90f26ae3cbee269f07/ravawamumanomukexodapa.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/31678683850.pdfIn PDF document text
    • http://lucann.com/Upload/file/gofiparuvojasomexemoso.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/1945782666.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840027021af---33684672273.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/2536bcbb7dd5f56071ec7c728e795e1a/miguzojosaj.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84be5d7fd0---bixesokojalevepakev.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/a27bd7929fabbc449812024f0842cc84/jubumimirevesanive.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/rugemeleguboxot.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/7q44qhk84t4s6294ute52o58b1/disuxuvamexesemek.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/15vn3lvr1mjq2dfnlnjuk41f1b/sepenepad.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/68c0a321a0c5dbf1c3e1c141fb14e12a/lelek.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/21480946697.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/27068588091.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76e42df391---zalawixadome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=adding+integers+word+problems+worksheet+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_off0000d2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DE 11084 bytes
SHA-256: b1f221c3212f3c36bcb3860669a408c110ccb0b83a5e7d9c28c412a6969094b0
font_01_sfnt_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 16604 bytes
SHA-256: f91dc1ea638a0f0b330d9e44c6a6f0e1ac9492a5aeb5b55dbaf45c8c95a37ad9
font_02_sfnt_off00011767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11767 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1