Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cdecf0819e9fcdc…

MALICIOUS

PDF

72.8 KB Created: 2021-09-30 21:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8d84247a35c06ad5e1efcae7acd5bd2c SHA-1: a84c415ecafece2cacf9a49a3048b2cb1092a4e3 SHA-256: 7cdecf0819e9fcdcb543be113e8d6cf3f3711d9dc84c0b20e75da957a366f290
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm on disposable hosting and potentially points to compromised CMS uploads. The embedded URLs, such as 'https://coretry.ru/uplcv?utm_term=mario+kart+8+deluxe+switch+iso', suggest a lure for users to download content or visit phishing sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://coretry.ru/uplcv?utm_term=mario+kart+8+deluxe+switch+iso PDF link annotation
    • https://www.informacion-indoorclub.com/boletines/img/file/29157911246.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/73145276029.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/76024682179.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/9414122228.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/watutowirur.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/vulabunimejatuzojux.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/maxipiwodisuzor.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b0cc39861---32739210537.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/gajajas.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/83929002017.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/27916506829.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/70159420544.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/dazitoroto.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/bavozabufokowam.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/penavop.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef400af0c5---87496503812.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/tekonuxawapevowowemolid.pdfIn PDF document text
    • http://orderkai.com/uploads/files/ziduxoranazezez.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/38977375934.pdfIn PDF document text
    • https://labelmarket.pl/data/file/xitoriparisu.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/95558567712.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/6e76e92b93a4de55e166d324784ec9a1/boramalasipala.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408e81b4d60---49464721692.pdfIn PDF document text
    • https://akemi.ro/hirek/file/lobolaj.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/d0fda5d582086adbeb98d99988fb90ef/44619431008.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_off0000b306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB306 18564 bytes
SHA-256: a791ed19338f6f166c566e1b8559c044201e68f7f881c9aefcc4ee3c6436717e
font_01_sfnt_off0000e256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6D 10944 bytes
SHA-256: f6a9eb26d9f96387670053431e7023f6a0519b5ba61daf54a216ccefc5ed748e

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