Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed0bf7897c4d6721…

MALICIOUS

PDF

73.6 KB Created: 2021-09-14 02:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5103f38c373e92ad4d364ce109ac2461 SHA-1: b29f959207302ea1ab57d756888f3e5e9a2e44b0 SHA-256: ed0bf7897c4d6721a721c8f365ee0b80af4cdcc09f8c253877673324fcc4daac
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself is also noted for having duplicate object bodies, which can sometimes be used to obfuscate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://hitourkorea.com/FileData/ckfinder/files/20210914_1B810013C77B7452.pdf In PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/88898376167.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcf0e44723---wupatomukepizopa.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/8b4a10e6575d923d72873165a51e5256/gukegitivojibugekizavo.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/ludomimopovakazokijafas.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/65542274721.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/sejivaj.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/vegafatorolulojuzaz.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/87140059123.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/ruvalinolinop.pdfIn PDF document text
    • http://cx-gl.hu/images/files/jipajefinomokisububavare.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/30412785775.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/97791955188.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/demolusalagixezokiwokuvep.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/66759291481.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/22264283233.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/96819861901.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/26645497199.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/tedipiwas.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/80834683788.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/6237160603.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/1a406c236905b0f482a6d32473efaaf7/80298201088.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/b6a48b07ade8e2c5da8d774ca2aa4bc5/fadenunefamudulawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=cr2+to+jpg+converter+apkPDF 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_off0000bccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCD 16552 bytes
SHA-256: 5fcf64af0310e08c508174b5e8fcb5b110b581a2b9d99dc1dc062fc53e6dffcf
font_01_sfnt_off0000e7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 10684 bytes
SHA-256: 7a94a151dd90a7334ca8d3371bd9d94a012142ea0a3fb0477103148910f1f8c5
font_02_sfnt_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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