Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7a9ea720fcb774…

MALICIOUS

PDF

116.7 KB Created: 2021-07-01 20:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 05e956643a403da27f90ad73749f64f8 SHA-1: 41d13a5a125bb5138324c20da63713af3d983e96 SHA-256: 8e7a9ea720fcb7748c1f0c9ff9540481869b1fe2239dae5462e576a0eb5ccf81
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that these links are intended for malicious purposes such as phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 5

  • 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://inwebjor.ru/uplcv?utm_term=axis+t8124+manual PDF link annotation
    • http://studiosimonepantaleo.it/userfiles/files/92877874416.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/48265744398.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/e1ed56128e7df1be3772f81990a64acb/63047739673.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///neredazufopezoluzosapiv.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/rasatex.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210618_b0e68.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/163fa952747361b7b17e8362c80bfeab/bamural.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/jkr5eir3sd3bn1c8u34g2b8bpd/fapigemetujisuma.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b21fb1194ae---gokakavawoxufas.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cf51a3b9f---68939309835.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/39954147077.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/futago.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/r1ckb3ij5369rn563auggcpnf4/39580011983.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dda70782c8c---34832408310.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/nifar.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/c91bc15ec494bca881daa4462507e970/41140500629.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073db48f1c27---mabaxo.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc667fd02---xutifoxe.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0629b38d0---xuvumug.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080124ceaa00---sawagimasebalodulinulosav.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/87086671026.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f8bdac242---sowixigaboju.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/turaxirepex.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f55752effe---suzuwomofubulibogifuja.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001534a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1534A 16348 bytes
SHA-256: fdc3f250e16d4eeaac0151c08e1678493ac6cc67090af3137bc700c4cd553891
font_01_sfnt_off0001699d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1699D 16612 bytes
SHA-256: 390910f2c70a4fb57d96e7ec068989707b3e5f622209cd9b7e3484829dcbb274
font_02_sfnt_off000194da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001acf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACF1 10560 bytes
SHA-256: fa4be7b8672791f6924938a9f4dc44629ee006b5b9f0f97cf15447522b178743

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