Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6de0cd343ae0c84…

MALICIOUS

PDF

79.5 KB Created: 2021-09-04 20:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f9121193d4ab414f0470e612362fe5a8 SHA-1: eb0289b52d38a734d5086ef0b435a4bae334debe SHA-256: d6de0cd343ae0c846962c5f73138dfa290f18bd07f4f7bcd09e3b9ebdf5c29ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML heuristics confirm its malicious nature, classifying it as a phishing trojan. The primary attack pattern involves luring users through a seemingly innocuous document to external, potentially malicious, web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drlanda.hu/user/file/lugezobiputojezuguzovix.pdf In PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/v2hntc90gs5fdf2aarvq9uqt53/netejagowanofu.pdfIn PDF document text
    • https://vleek.com/uploads/files/vuletexexipunudes.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/japosumu.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075be5d040bb---12853277409.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/aa9e0b2a44953cd233342b2f9a64c1ba/2620193220.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/kegiziniju.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d3754ca9b---21467081133.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/vevorigat.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/rujinubewuzenujemojimuwol.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/293ddd545838b08286073e851ac84dc7/vedogujorugosumate.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/88472164059d7fa2ace743b3c66146f7/fodijuxenaxatafi.pdfIn PDF document text
    • http://nashcentralfalcon.com/clients/d/d5/d5bea9c86035def548a020f7371d19fe/File/92601733736.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ecaoi2allanu12f4dug9v2mse3/26577266967.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/3e1ecfaaeb2a398eef9e1adef48370cf/sokirusulirafosof.pdfIn PDF document text
    • http://sam-global.ch/files/file/janolafuz.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/puxofemofaxigekipulonag.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/tonenegifiranegiw.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/78600343481.pdfIn PDF document text
    • http://ahchala.com/img/file/34516801495.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2304462de5---dizisurupazumuvubaxufa.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/84458542194.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a9e06e636---nufopus.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/87384874909.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fec2b854a5---tofifigetosaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=chords+music+theory+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_off0000d140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD140 10816 bytes
SHA-256: b4148ba83b8393c2782bc4274abd5023f07feb00766b06f3ff21d7847416cbaa
font_01_sfnt_off0000ea49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001025b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025B 18128 bytes
SHA-256: 6d7099c9a68536638ef3fcde48a6a9d399fbff699a75890312e924a3f4e19b1d

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