Malicious PDF — malware analysis report

Static analysis result for SHA-256 0198318fa5d8221f…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 11:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b00c992a2e6263fe7cad81a06a3853c4 SHA-1: 3f5a0530c8b2bf84a10a3ace4592fca66f7fc8d6 SHA-256: 0198318fa5d8221f1c4a8037e45b57a3a9d1fdb865daa5fbeed868b8f4df624c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing multiple links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://krisoc.ru/uplcv?utm_term=partituras+admirable+danilo+montero+pdf PDF link annotation
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/426c8f2d05e51adfa89456c29b2d038d/ferurubufanodazanenibeze.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/boraguwe.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/42701086374.pdfIn PDF document text
    • https://kultmotor.hu/images/files/66780845248.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/152159130760a5aad40f855.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/29171309973.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/kagosujibukot.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/74579382539.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/rojixelabemobo.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d66a8df10---34512538278.pdfIn PDF document text
    • http://flexa.cz/docs/file/35085507905.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/tukujorirofazixome.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/r8c38rahjqle8kv90s8sv9n2k6/xigos.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/79570417977.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/niwap.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4a99c7149---18374538326.pdfIn PDF document text
    • http://faulkfamilync.com/clients/c/cc/ccb94402b1eed20a0583117be0c0b506/File/18635265935.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/varizariraga.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be62144d3c---gofivazivisumu.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/tijiwapiwejo.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/58322c5a483771248b27f4178da4c0c0/bofonojibizovajanasoxigi.pdfIn PDF document text
    • http://berbun.com/user_img/file/sufefogamomevovidoke.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/loxukopeteguj.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111c60e3ea8d---zikisirexuxemup.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_off0000d8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B4 10900 bytes
SHA-256: ecf19ac6cb2625c6f991f8d8a656bee2a644a21bee6d07274fd6c51f7411a460
font_01_sfnt_off0000f1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A6 20052 bytes
SHA-256: d70c0f4bf178bdcff26fe4a795bc0079a9911b50bd4afef9db3a189f1841a5fc
font_02_sfnt_off0001257e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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