Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bdc6ee29b6b2692…

MALICIOUS

PDF

76.0 KB Created: 2021-08-31 02:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 993a17449de6b93b5be6d4af3f943061 SHA-1: 81f645ecfa8cb59087be36e902de557cf25bea47 SHA-256: 6bdc6ee29b6b269218fcd09855aeb76b7f31e41ef2dc31fb6c90bd70b25d7784
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=chinese+elm+yellow+leaves PDF link annotation
    • http://splhardware.com/UploadFile/file/2021073115110473499.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/1731130951.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078179cdc4d5---61514427658.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/vejunefozuguvagib.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/vebitujudigenivopijit.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/59481166744.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/fasijogejugisotizotexev.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611b382899fe1---65292812869.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/dututebavagomidozixa.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/91258025703.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607509661da8f---90506700781.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/91596130849.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c7dd22c94---pajumikuravit.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f881848e8b0---romujorivujaretiw.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6e07dfe90---54423309366.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/kufuzore.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/85689069815.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/61c3ee7b23009235fd5ff34db3379e6b/suzomoxawap.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaac35010dc---70819287533.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/9414899048.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/52eeefbc3047827f45d8284fdc42c1c9/xisutugezulawesafefoku.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210816152434.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073b4cc9b131---pijate.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_off0000c851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC851 10472 bytes
SHA-256: d4a7a593e881892beb335bb559cf2efa235f6347b34c47cfda81df742391240d
font_01_sfnt_off0000dff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF5 16748 bytes
SHA-256: afc7f07a302ca82d41d708c1001d20757f1176fb0a7795dcd0999761ee55676e
font_02_sfnt_off00010ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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