Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae9190bc1c3b979…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 07:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ffe6dbbca4feb1935a402d1f40dab183 SHA-1: 4b87a1d78e71fd892c8b7428f4577c8a62001568 SHA-256: bae9190bc1c3b979473a4ca5a31829bcede7789a84c4e630458985cd5d6be0e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://synerhu.ru/uplcv?utm_term=andrea+hirata+sebelas+patriot+pdf PDF link annotation
    • http://castrolmintabolt.hu/images/upload/file/nameresigiloxogemofij.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/33780458215.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/83200187475.pdfIn PDF document text
    • http://grandfiltr.com/files/file/3406070064.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/64321159736.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/92962385714.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078ecb50fd84---33985553804.pdfIn PDF document text
    • https://digireg.es/upload/sabijivaxaresedozu.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/bc25d58a9c9c60f6d8e66f9e72e7d875/62920292930.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/82891381880.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///jafanixulibozakem.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/058a3fe9c1de44c51ac6048b487dadc0/zubixizenidarevu.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/tewunegugabejipamikezixar.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/43801905230.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a94903f073---ruwixexetozovik.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-7-30/20210730150453348919.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/sitetasanegogatuwuruj.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/99161046774.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608786dd9cb2a---somimizegojir.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/kezixob.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/83157ff3e0f22534d42240ba7e6244a6/95056217499.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aab69001049---bagusipojizuvebivugom.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106010837011988.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/9985294108.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/18812810238.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a719b3b545f---dotipazowizuderabivuva.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/epvaedhftsvlajtjmf0u54hbk0/motoguzotegiruvufasedaxiw.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609836e6a056e---pabuko.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_off0000dcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC5 10716 bytes
SHA-256: fd4d5df59e01038b7898e0e2ea4af48953b91033408bf27595d84dbd3d924274
font_01_sfnt_off0000f509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 16432 bytes
SHA-256: 7280cb6724e402abdee40f76c49e2b0ba67e11a0a15d3430ab1bcc7f190e6130
font_02_sfnt_off00011ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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