Malicious PDF — malware analysis report

Static analysis result for SHA-256 96afe507bd911eb2…

MALICIOUS

PDF

77.9 KB Created: 2021-09-07 21:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3babcb4735f653ff82b1cc9696824179 SHA-1: 859512b4f4322b18cced96c3a91db3d4f4602b51 SHA-256: 96afe507bd911eb22f226d7378a600649fd3bb959f8bdae10c263144219f5ef8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the overall structure point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://irlanc.ru/uplcv?utm_term=chicago+booth+review+pdf PDF link annotation
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4ada6e0f9130585e7948ec4aeff388fc/wonugexusudikivegexaru.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098565292048---79972017636.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ed912c0ce---nozidaredegilaneweleme.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/tasukofifawejog.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d764fd4d9ba---pixasupumumup.pdfIn PDF document text
    • https://cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/64997365796.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/gefom.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/21/file/16684096355.pdfIn PDF document text
    • http://a1-recruitment.fr/v2011/Files/fck_upload/file/jakuvidiso.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/3362834569.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/gudivuxekupub.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/8b6f984f4ffd48a389dc8a0e36e7f726/voxuwisu.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///xetimonogebisifedabubixoj.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/xasajevup.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/powifozimej.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/puguburako.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/a0e0879b9c885ea72615c5c108940ae4/51360132761.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49ff6b916a---bezegigufutir.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/dalizafisuxitujejesu.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/c301aac1f8c41aa82cb393eab492bab6/1563119591.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/69913131978.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607881959f7dd---49351054118.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/ifkpk2iogda2epns6bvp5p1nl5/lumegefoli.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/76520105085.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/24240039970.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/46722042304.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_off0000c9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C6 10904 bytes
SHA-256: 8bd45e19ee2095bc5d0debe9908fc03d0e8947eeb6573e11bd61fb97e595915c
font_01_sfnt_off0000e2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D9 18384 bytes
SHA-256: c46db105ebc7ca11bb9e97e29f757c4b2784b563962389c858170bbc81141879
font_02_sfnt_off00011221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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