Malicious PDF — malware analysis report

Static analysis result for SHA-256 286e87a468bd73ae…

MALICIOUS

PDF

88.4 KB Created: 2021-07-06 21:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 79d65dc88f5738ddd22a3bb8ade6ebff SHA-1: 5f188952d36129fde9845d00a358de142ab42d43 SHA-256: 286e87a468bd73ae0dac955ebecc814beab22a974e15cbf64f8d984ad401d74c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=minecraft+how+to+join+lan PDF link annotation
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/126262ac1fb2d9c65bce4fb21b901120/semubuxofisifudila.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/le1ie8smjbbatn4bvoaalotbs1/sudup.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/riwuwurinosuxovajoz.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pafikifimozumozimuru.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/rimoxiwukefefokukarabo.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/vased.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/tisedenupajozupes.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ilil3mnfa855vohatsgn7nh993/jexasa.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/9c8d5b3167b7bba9d25ed807a2fa07ed/jevemuzipanuwulot.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/90189180772.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/41227254167.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/45442124605.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/46156666505.pdfIn PDF document text
    • http://nfc.soo.jp/file/38691432130.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160be0f5ec2e1d---babimidevijumudakobe.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/98850119976.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/0b96fd84b096637b597c14ff13e195b4/95826407153.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/057ikdh5qbi49ll03ndf992qi7/12261380297.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cdba1a73fac---darebibamadatekitixudiz.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8530926d---buxizuputuruxoluw.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/74431017464.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b3f8a40fa---tanuzokarujosijasi.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160845a3363fdb---9690908772.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/350ed92db36f7dd292647b88ff6209d2/kexelijilujer.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_off0000f85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85F 10476 bytes
SHA-256: 4a2a06d8ca9df4b5a8f4c151e5e9fa9fa4d066f100f8c06251167cb01455f710
font_01_sfnt_off0001101d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101D 16992 bytes
SHA-256: 8cc4bfe6616655071de3e0088ccd1f69a50eda7fa0e94c898f8515a8dbfac4d7
font_02_sfnt_off00013c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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