Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eebe542c13863d1…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 17:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c1b845d13e9a4543dd00b373c7061b2f SHA-1: 8d9ca694d74a6ef544d2f3d6137a408d760c5347 SHA-256: 5eebe542c13863d1e8e8b8d943d235c9f08ff97a11b36f2808c7801d81de9549
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious content, likely designed to lure users to malicious sites for phishing or malware downloads. The presence of multiple compromised CMS upload links and disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=writing+with+pictures+uri+shulevitz+pdf PDF link annotation
    • http://mabifitness.it/userfiles/files/veridadoxajanuloni.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc8346e28---nuwires.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210906_054656.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/35335471732.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/nekezuzinebif.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/9282aea44797dc8d7a3feefb46631fb7/59479322042.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161420a15d8bf0---sesujufenefa.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/zikaxubenab.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/42790108643.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/jerulixafexivubabim.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613a60517665f---giwegekuwukol.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/v6r5ffcmfqg10i2gonqgf5n8j0/31271074692.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/34494729831.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/45223988042.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/lusajuperu.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/61260101937.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/zevoxakupelutamuza.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/godisomomatamo.pdfIn PDF document text
    • https://goodline.by/userfiles/file/93772511550.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/fotarigubifawubirofaro.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/38226792860.pdfIn PDF document text
    • https://phuquiland.com/upload/files/19556418844.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e76ff32d0---21272337070.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_off0000e184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 18832 bytes
SHA-256: 5365664354bab4bee60d9562daca971f1b68693cbecaac29ac5d0b45396d17e8
font_01_sfnt_off000112a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A7 10924 bytes
SHA-256: 156d057aa3f0b9b14cfecb6c4639a907f8d9d7f687345cd105ddc0fa49669817
font_02_sfnt_off00012bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1