Malicious PDF — malware analysis report

Static analysis result for SHA-256 e116c0acc012f84d…

MALICIOUS

PDF

79.6 KB Created: 2021-09-03 14:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 46411c52aeae4bfa21391d0682155383 SHA-1: a7d1d9a32052aa03612b038f2c62f40835b938d2 SHA-256: e116c0acc012f84d510372c90ee478cbcce7ea59121e1c5200c25ac50f64eb90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of external URIs and link farms suggests an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pixomot.ru/uplcv?utm_term=pantorouter+plans+pdf+free PDF link annotation
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c951a9386c---lexomafa.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/90790101687.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/62310561527.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/14034849514.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/72066705675.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/3aa0bb2d3d28ee403c81cfb24356a5e7/78870960259.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89eef38d73---ruzutemobe.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127dc040a1d3---41150160850.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ed973e31a4b---xorojunemumikeropanuw.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/sojetivapimof.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/6tua649jome7ebrifdjrjmrgq7/94827124259.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/dcf3db6ce96d82152171eaeee21cdcfc/65012793636.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/56488187191.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/79138509102.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/dasotorika.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/lutasaboxajunitef.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/nisukadedovolivebexalinuz.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/30930448105.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/68768811921.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/ju69ctt1dcqlvl6a6644uh7qd3/48056021082.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/faxesegofubewezugozet.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ad50fc31cb03e7b1299b8069973a8a9/68184628423.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/32519867424.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_off0000d201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD201 10500 bytes
SHA-256: fd5906afa72dee5c170a8d09a773f9c95119d0db946fe97755a93b5416cdf3a4
font_01_sfnt_off0000ea0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0B 18392 bytes
SHA-256: 56346ea4fc14e16b5ab396dd8cefa6527487a35b1c970906258fb05e53bfa45a
font_02_sfnt_off000118be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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