Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54b8dd2c33c7fa9…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 08:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3ad43f185b9e481e4f021072064e4821 SHA-1: 7f6d82ff47a56612c0bf5df7e7a9949636727b27 SHA-256: d54b8dd2c33c7fa99534490ce79969fb4786b71568be5aa7bb9be56e215f00fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to websites that appear to be part of a link farm. Several of these URLs are hosted on compromised CMS platforms, indicating a potential for malicious redirection or content delivery. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://candleelectricals.com/uploaded_files/userfiles/files/worib.pdf In PDF document text
    • http://gardenofsound.com/userfiles/files/geraniwo.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/35321366635.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/9803235477.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612faa00493c2---38065487977.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/33133036612.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/kogobetozena.pdfIn PDF document text
    • https://huanghecables.com/d/files/76483930722.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/felekifurapesebubini.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/dulifanetilepedamuboji.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/44486544241.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/jozivulejomomuwamojakenis.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/95359224781.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/6f48f9c60e0df53cd5e5741876cae8e3/mejogugad.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/kofusudewogug.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/16133463729.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/21683412343.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/karonal.pdfIn PDF document text
    • http://www.heksan.com.pl/file/kutapakowegimurezisud.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/tuzogixabibuzizewume.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/futusafoluvi.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/tr9chusvotb800b7j8t7dd4vvm/4179078036.pdfIn PDF document text
    • http://gibisch.com/files/files/43060244749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=beetroot+is+fruit+or+vegetablePDF 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_off0000d970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD970 18268 bytes
SHA-256: 7be8f84264ac9d0072eec156b7b0d561c1556035f5139c051ac8b3f2d857fe6c
font_01_sfnt_off000108da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F1 10644 bytes
SHA-256: c6640adc2d65f973798154a83786f42a2b3d42368b38ccb6d373f2d274154646