Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea2e50052a19152…

MALICIOUS

PDF

85.0 KB Created: 2021-08-29 20:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e75f2ef5c1c0a45b808454f2f0cb0b62 SHA-1: 6fbe1c13fc2b6052ca73b0b13ac742ab3529d060 SHA-256: dea2e50052a19152b84fc844e093af8b8b92c96356477fd3cbdc5906b524d57c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious. The presence of external URIs and the nature of the links suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://vasvaripalmuzeum.hu/upload/file/74366682476.pdf In PDF document text
    • https://maychieuvinh.vn/upload/files/92929205262.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88f6976f28---48364217219.pdfIn PDF document text
    • https://bfull.ru/uploads/files/bubulubofem.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd2dd10325---28839886726.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/fazagomuludurudajijos.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/pg99dhoh3h1csnq5a833mrnta3/13880440852.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0aa1323d64---jopixu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afee69a16e5---lizipogeteguxapizuruz.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/98939334546.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/30897559838.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/vuforidegabusa.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/18948981129.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085073c482aa---tatotikipi.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/89927173580.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/77797616720.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d79eef5bb7188d531748e3906e0934b0/senigukofesajivadib.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34899871639.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e3364f747---98281835311.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610739e8d2445---duwojujeborebi.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/79526696934.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/21663441553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=creating+sounds+from+scratch+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_off0000de1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62E 20280 bytes
SHA-256: 9c445ed0ef977135574be4c3ab94c7445708487012bc6914b29153b3d16e4540
font_02_sfnt_off00012adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADC 11152 bytes
SHA-256: c9275e8d774cdd72a83af913cc6892775ca98c88b3a8128a431696ec9af5d039

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