Malicious PDF — malware analysis report

Static analysis result for SHA-256 230656e6b3a5e66b…

MALICIOUS

PDF

109.0 KB Created: 2021-09-17 22:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b2f6e998f32290a957bcc9445f2396a3 SHA-1: 4438e5e981e8d5e6324b680718f18b851fbf68b6 SHA-256: 230656e6b3a5e66ba9a81d432551ac8825efb44242e7145e768007fcca446cc7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the URL structure and heuristic firings are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://garglob.ru/uplcv?utm_term=fifa+20+android+online PDF link annotation
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33886240062.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/87545454563.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/55983391468.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/xajojitiredajomalol.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/2149836697.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/18492816135.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/65672922140.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/javukem.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/58baa7590f9c8538e58e6b1d86060135/14599983236.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/numigufumugilotefepi.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/sewebuxuz.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/27000151357.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf337256b2---86304010681.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-3/20210903082507154797.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/makuxawag.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///vujepuxebu.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/nepinadogububafuzivovi.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/kafadudofosibovoxasotivam.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/30029044890.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132af38a189e---47638478774.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/92684610106.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/jipexedab.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_off000140d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D3 20772 bytes
SHA-256: 8509a3cbdd4f8c63bbd4c0d005d1cb14fbff508461b6bf6ac9f4d0acd6466615
font_01_sfnt_off000176c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EDB 10300 bytes
SHA-256: ca151be5c22d8cf586bf02ba6b6ad016ebf620cf85d2f12b3208ad24d82e4281