Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4c81d47e1f6b2f…

MALICIOUS

PDF

79.6 KB Created: 2021-09-13 11:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 263bd71445e98e305e0b3d3efa9e9056 SHA-1: 0adb607c0c57a05aa3a3690641197c6b34aba414 SHA-256: ec4c81d47e1f6b2f177b7a7c43727470be13a901436202a24c2fb769ad741036
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various external websites, some of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://carrozzeriabosini.net/userfiles/files/39593347672.pdf In PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/59115624421.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/8d5bf577b84426a83f32a177e10d8221/wevawapip.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/zoximagofanefe.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d6433c4550cd80292f60c94127a6867e/wasiwatal.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/49613395020.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/81445932536.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/22146676215.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/seseweziwilarobojanapuz.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/76239464281.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/51748378562.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/barotabusize.pdfIn PDF document text
    • http://mp-journal.com/media/file/zabokomevepo.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/jejivakuwemubosubaminujul.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec089cc17e---50324091173.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/fixirekudolez.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/98773562084.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210909_F149FF790B14B3CE.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f36053efd5---19852291594.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/fitifedefixadopuz.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109021254053322.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/ragudogelulunedilexokera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=2020+robux+codesPDF 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_off0000d401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD401 10348 bytes
SHA-256: c163c310a56eaad081bbd1ec6c1591e274f2da93bdc12387e0f8d4633bce373e
font_01_sfnt_off0000eb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7B 17304 bytes
SHA-256: 4d10ee65db34278f6f9fce9d4faf28d46d73f723d57ae9330ebd0864352b7114
font_02_sfnt_off000118a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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