Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece344184c048ceb…

MALICIOUS

PDF

80.2 KB Created: 2021-09-04 23:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b58aa078952c337369ab61b82000908 SHA-1: 043a3ce39572f4db0117461adb54d95a20a48732 SHA-256: ece344184c048ceb6886ed3a56efa9850dd1715438ea0c5649bdd3a6f38ef43e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

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://crysiq.ru/uplcv?utm_term=download+soal+cpns+skd+2019+pdf PDF link annotation
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39a6a427ea---givinixupimib.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/28816568846.pdfIn PDF document text
    • http://goldmustang.ru/files/files/68589429407.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/tokupususa.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/kitubumimugamodiwip.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ab908134e---49183540996.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/xoluranojowuraposikelefi.pdfIn PDF document text
    • http://iphysiology.ru/upload/92437802925.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/sakegovujejepilowewepodaj.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c56829c2bba---lapufoba.pdfIn PDF document text
    • http://asustainable.com/global/file/91169394935.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082a21873d04---musumujolopusikinutawuk.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f633a57c5d---zotix.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/24970501500.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/fozijodudokemotafibekit.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/71507973885.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/pulazoneselapuveburutimap.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/91199929264.pdfIn PDF document text
    • http://deryalvincotokurtarma.com/userfiles/file/bolugiwukolovomegori.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/b81bfe085d7ffb279dd0a1bde48333b3/tudejisiwobusa.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884a82c26f0---kajerojijufurawikud.pdfIn PDF document text
    • https://amblamy.ee/upload/file/xaxumizig.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/80952556552.pdfIn PDF document text
    • http://matras-devison.com/upload/file/65291437185.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_off0000d503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 10832 bytes
SHA-256: 0989d4d76a80813953310688da9088a14b9e43f6960c701cbee381004eb6fd3e
font_02_sfnt_off0001065c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065C 17588 bytes
SHA-256: f3f0ed6752cb4405d8ef4fe70319c52b8323654e61015a79d822f255bacbc745

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