Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f65dc2630be2dd…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 19:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 275ecd9f95b744922d4b43768d544ce4 SHA-1: e4c790fd65693fa380de84c1b55300071b145592 SHA-256: 24f65dc2630be2ddf38163a3cab23f64f1fa0d1c79c70aabc873e965261df6e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to obscure the final destination and evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://aburobocon2019.mnb.mn/uploads/files/kababibof.pdf In PDF document text
    • https://banderlogclub.ru/Files/file/zeporobelilurupami.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/15027142214.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f02bc2b76---51849372233.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/10537108260.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/22780570836.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/25363311292.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210911100735721249.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/pusazimajovawagi.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/30525837172.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/rasimokigob.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/96809202239.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/267694934.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/62668280075.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/87382145631.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/kedasipigeni.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/44302211814.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/57734734272.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/dakokipima.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161385ccd442ff---vosasajumaponisik.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/51917353081.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/41723792736.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/20901846597.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/4odf9p0p430fml9j13lq5oe47h/gedagutumivumonulitoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=olivia+williams+manningPDF link annotation
    • 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_off0000e45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 10180 bytes
SHA-256: 33f78153ec179ec0e0257a0b99eb08a85f5f67655a11007c6c00de9083ebf0e3
font_01_sfnt_off0000fb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 18576 bytes
SHA-256: 834df368c381584573c6ea03d765ab5adb11c60af373b6423f485e7c40ae0733
font_02_sfnt_off00012b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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