Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b85de5fecf8ddf0…

MALICIOUS

PDF

79.6 KB Created: 2021-09-15 23:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 19feb57747fc734688902373a526f460 SHA-1: c3a24b7fa6d5631d8a132e05c93b8aaebf12c203 SHA-256: 2b85de5fecf8ddf0d2b32fd49afc2b91acfa3d46657a5b664df8f7139ac723e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or facilitate phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://smidgel.ru/uplcv?utm_term=harry+potter+potions+pdf PDF link annotation
    • http://yakutiaprime.ru/SITE/files/editor/file/81703829980.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/fivomulamudewedibofom.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/74012669387.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/27761772080.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161368fbbbd7e9---94425662437.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/8982689321.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/57301464072.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/45659156819.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16134723fddd15---lokisogegugujesep.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109152312071121.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/getisi.pdfIn PDF document text
    • http://jucal.es/images/file/sasafovurelivezeravimuxeg.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/79215823346.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/83662414738.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138d15bb2c13---96765565446.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/pazifaketunamadude.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/sufaxodozasikonejawiti.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161386faa6bcc5---62456924439.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/zutovufinofasubela.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/95654013489.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/pimubevexigu.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/36963256929.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/28678811565.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109110516216772.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/bogebonujuwituxidoparu.pdfIn PDF document text
    • http://4rrecycle.com/files/file/45808387322.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/31977312670.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_off0000d4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB6 17160 bytes
SHA-256: 8eac88c04f8b4b1181fd586b1437900ed7774948c29621a22c9efaf8f5d35cbb
font_02_sfnt_off000118b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B8 10548 bytes
SHA-256: cff106d958c3c7226430dd9798cf0d341522f8417b1faf4b2cfcf8248080580c