Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f23691ecf3b199…

MALICIOUS

PDF

97.4 KB Created: 2021-09-03 18:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 915e86ace1fbb430b4f5bf5d7b52d211 SHA-1: 7312738c6d659798b596e22726aebea3db417cb2 SHA-256: 08f23691ecf3b1993100781d5da4a561da3f8cb293712cda10512a4d131d8ec8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the detection indicate a likely intent to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://philabc.ru/uplcv?utm_term=descargar+el+ramayana+en+espa%C3%B1ol+pdf PDF link annotation
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/44819653688.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/sigejanuv.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/fuxonepapi.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/d2ac902b3588ecb9a08707ce3e249f6e/94547847308.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/35690307999.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/powugafazitipilegegafimen.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f2db446e1---79547088072.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/12595744941.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb98cd855d---jetinareveguvedizizefu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608783f76c9ee---7816451964.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/533a39f4dbf168e539d861310f8506d4/63753050645.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6ce265660---rigebidepogo.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a4d4c98fd---zobimozoguvaginonu.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/37046464799.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096715cf187c---11820737585.pdfIn PDF document text
    • http://arablift.net/userfiles/file/76505248116.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/91425946544.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b6cfe5a06c69137efd99e6c8e19d0396/nakodoxobiw.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/56822cae81b1eafa1de46fcde479a120/80334154267.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/pidomuzaxogunogodalo.pdfIn PDF document text
    • http://yulintimber.cn/d/files/gatiboxuwumaxugafatikode.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/75914956130.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16098a9f37240b---68865980164.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/74621493809.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/81572a473c3caabc100dfa210d25f46c/sabutaneveneli.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_off00010e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E37 21256 bytes
SHA-256: 38cdb70f4bf5b516ec4aafbaac02325a683be5c711eba1331d304acc2e7abd52
font_01_sfnt_off000143e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E7 11096 bytes
SHA-256: ee4b13bd302d0cfcac8a420c650cd9e9c28ad12bfc32313143f3b3f60262c4c5
font_02_sfnt_off00015d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1