Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3f0dbbaf3f4cc3…

MALICIOUS

PDF

96.0 KB Created: 2021-09-01 21:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ff070a21d80b6ef089462e1dd72d4b75 SHA-1: 2d9eb71486f555a001f36839c5f54c8995de18f8 SHA-256: ce3f0dbbaf3f4cc3f6c453a0ebe94392f72dc54dffb50259ac3910cb9436ad6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm or redirection mechanism. The PDF structure and embedded links point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://medvor.ru/uplcv?utm_term=voltron+prince+lotor PDF link annotation
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/quvenpihtl83t4gqq6qm8p4qb4/niwidoguzapukikuzeguf.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/tipenawegifipesuvovuju.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/fupawovupemuwita.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b539a5bb0f---90024257325.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/fazivewuxabevefitirawu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/amhfp2jvbnltben7sqsnr09d95/85447934485.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/44871872223.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771d877bc42---kofekesetapeniw.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/zukakaroxusoxupe.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/1138ef97a9736892ec097138e645dcc0/wanibovevajakuxorifota.pdfIn PDF document text
    • http://willbramephotography.com/fitazuvusu.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-8/20210508081220215608.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/d9d23242fe90a3fd505562aed5044b11/76515897909.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210818_49D601550291637D.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/32794255425.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/41610127494.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d28fd96bc---7047073736.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/59642862017.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c67bb67cbf---74432831373.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/42332016922.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071093b1ddd9---43234572401.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_off00010e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8A 10008 bytes
SHA-256: 0e0d30ef5ff34293c97ae553ec148dbb3fc0e22748f2094a353435875463e461
font_01_sfnt_off000124ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CE 20780 bytes
SHA-256: 38731a8628a637857437697c1428cf01216fab82ea7dbf7cdfdf4f2b01a52dd8
font_02_sfnt_off00015adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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