Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f64edfab02ade1…

MALICIOUS

PDF

82.0 KB Created: 2021-07-08 01:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e277f2542d280b67122a2cac7956de54 SHA-1: 54c0819898d4a420f4b59746c21726bc201d439b SHA-256: d3f64edfab02ade11948eff235a8a8a1ebb57cd24fb10f32da8a7a3125a5bfef
156 Risk Score

Malware Insights

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

The PDF document was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and potentially disposable hosting. The presence of numerous unknown URLs suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2a8758b10---14064928612.pdf In PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160970eeb6965f---50032774907.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/26629b427398d5fabe90a2c94661f0f0/titanatuvi.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b7d91df69---kafisi.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160725e6f66265---82337675144.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d97fc90b9---87270095644.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/671m75sde8r4e58jrs7v92i8l8/xotirusibutututivu.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/5tbe194n3ia6k87st80310b175/vinemewa.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/kagaropigajejot.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609835918ad37---vemit.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/bg41okgm4n77kkbcnb1k1v7c56/xutezaxibigadukun.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/88ad976a8079bdb72a524dfe98fc9acd/4265165132.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b51390a75---xerexomubiligew.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/883431543.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/jubapilevubaxebof.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/gajubuladafijudojolomol.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/zuretuxegizafomaxozon.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/18a92aa7095e6739ffa767d2e558f944/34003197032.pdfIn PDF document text
    • https://geniodelweb.com/file/tebemis.pdfIn PDF document text
    • http://zuche0551.com/upload/file/35465969629.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/g9r85nbq5vn2atjj6rv973cbb1/pexiwuwaruxubejajexat.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/nfprl1j9ng0v7isendu1rqm4o2/nofofovumeve.pdfIn PDF document text
    • http://mosjob.ru/images/file/13892662703.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/98382783981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=taylor+swift+and+camila+cabelloPDF 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_off0000db4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4D 17592 bytes
SHA-256: c288f1252d76f830f7581b78265aa120106304fa118cab08c3b1970becc6f09f
font_01_sfnt_off0001093b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12152 10940 bytes
SHA-256: 68f1f6ae5fca92b5e19915f051decbb384f6018f740bb78dd18c0475916790e9