Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a52cf304339916…

MALICIOUS

PDF

91.6 KB Created: 2021-06-29 00:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 33b26dbf46558efc7acf47bbaa88b221 SHA-1: b996a2d4ccd7cb7c6b1cf79bbc7843e4ead03c8c SHA-256: f3a52cf304339916e2a5d2d7eea99551ccafa27ceb4448b89b1715d03ac17470
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/3ad017025cd5f07c7c91930abe09250a/kanawogabojadafo.pdf In PDF document text
    • http://architettotamborra.eu/userfiles/files/91748518491.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a043d1c960a---50084664208.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/kurabikav.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/kinevakuwitusa.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/dewopemoboneb.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/fowinevabilo.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210607185534.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d99c8d1faf---tufuvetewilidususav.pdfIn PDF document text
    • http://rc-modeller.se/images/file///wolezegodu.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/14707636707.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/4881408082.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/91b05ce1030937d40ac51ddd96563a70/digafizasefugidasamibepet.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16091421892b45---kegopamutuxugabivibub.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/3024629801.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7163d08fee---54546741691.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160d89a70501b8---20919912055.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3ad2c8d86---nakidegumabezalawumelubud.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/86f6f3d8edf923754f29d23e706a54f0/10336350905.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609429b357fde---vazutetekusek.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/17600527954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ps+now+androidPDF 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_off0000ffd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD4 19644 bytes
SHA-256: 38bcbfae288f62be6fc61e38093b55d1bde67e850eb55492a659328aa92a4fcb
font_01_sfnt_off000131db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DB 10052 bytes
SHA-256: 92e87f4f7a07f8aea4f60e0524cd3d119a208a77f4aff3efee358afe289d7376
font_02_sfnt_off00014857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14857 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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