Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6400044c5944c88…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 12:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 045daa25f8e98c8795d2b81d00efd249 SHA-1: 22477877859c49502f0e8ea7be8bd7bed6a8e264 SHA-256: e6400044c5944c88ee7c2c2413067f46cabba60ef1acc4327ea31ab605f00d1f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that function as a link farm, directing users to potentially malicious websites. Heuristics indicate these links are hosted on compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=mistral+ceiling+fan+manual PDF link annotation
    • http://esoftland.com/userfiles/file/47705414273.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/kitukumavasuwujetepakemi.pdfIn PDF document text
    • https://unosms.us/userfiles/file/39779269860.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/20913573460.pdfIn PDF document text
    • http://poiskvod.ru/images/file/36628117649.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/d29d47d5fa925766b2258461a432f86c/95636149359.pdfIn PDF document text
    • http://renknh.com/ckupload/files/78183250664.pdfIn PDF document text
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/fokeropewejazudojure.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/1398808894.pdfIn PDF document text
    • https://limadelimon.com/images/file/zuzoremejupug.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c572bec6312---94603367321.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1624914348.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/40e0375c9af380b8c44d298d8d7a6ffd/bizama.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/469729b615410a154d2467605bd9059c/65323198873.pdfIn PDF document text
    • http://krugernilssonreunion.org/clients/c/c3/c301050bdfa85653d7453904791897ac/File/mapefomemo.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e50ff5fbb38bb0cc516a6a130f6c58a7/73515221600.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/25100749109.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8ef9aff6f---wapefegez.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/sususadetu.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/mirubogorega.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/zigatiwivukovorusivije.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/25e58dab054b3bf22b8f0b906895ef1e/jirepevevositedozaxezugo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97C 10652 bytes
SHA-256: ee2719a0c18f4117b1d6f28d5992b18784b875ebeb7bbfba0d77edf709703bc5
font_01_sfnt_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 16576 bytes
SHA-256: d0f31a50ec8a8ddaa81feeb6c64b5a7bb17fc72e4ce36d6d35173d9a76da3754
font_02_sfnt_off00011cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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