Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66ebcd7d95649ef…

MALICIOUS

PDF

82.6 KB Created: 2021-09-23 20:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7770ccdc9179fa3cce22d9b6086baca5 SHA-1: 912e9445e17b9bbae670a7a7738e40e15e6a9c41 SHA-256: b66ebcd7d95649ef363d84283d5f762cbbdce1bf5596b4cf93dcecc5e5cd4f9a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classification and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple external URIs, including links to compromised WordPress uploads and a link farm on disposable hosting, suggests the document is designed to redirect users to malicious content. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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 https://chcial.ru/uplcv?utm_term=lucky+patcher+apk+versi+lama PDF link annotation
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161458499df617---lozatotevugeri.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1c3f09188---daborodetu.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/53556717468.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/36056875409.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210912_135655.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/44791555236.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/xajuwomeviriwurudifunejik.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/39999363549.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/jikawitumupugudibonili.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/51245554411.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210908153804.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/66883559008.pdfIn PDF document text
    • https://nistd.in/userfiles/file/zigexi.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/82498359567.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/99372065026.pdfIn PDF document text
    • http://salespate.com/userfiles/file/85610544508.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/zarexalesip.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/lajap.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/xijagozumo.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece51543be---41086353321.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/lexagomunexesawe.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/zaxolivisutimepa.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16133640a30efb---pilafe.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_off0000dfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCB 16920 bytes
SHA-256: e2287288d0309ae54ef42bb3af776488d2a8ed0c0c03dbb148ac7bc7b988672f
font_01_sfnt_off00010c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2A 10744 bytes
SHA-256: 68a876ea18cac92beac426607d6b71c649b254bf5df7436141d0079cf0cb3468
font_02_sfnt_off00012504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12504 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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