Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2b37a6062908f1…

MALICIOUS

PDF

85.2 KB Created: 2021-06-27 04:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc01a62f52aa0c538a57fd5fbf497403 SHA-1: d6d5987593170d7d802a2deed3679183f1480674 SHA-256: 9b2b37a6062908f1e1dd4e338108e997dd84424dc357dc90e854eb6d3cc6bdeb
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The presence of numerous external URIs and link farm heuristics confirms the primary function of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://graphicyazd.com/ckfinder/userfiles/files/50923633312.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160727c68a43a9---74789951889.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/33596f7971e448a697ce9df04dc8d9bf/lujafivefevixu.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c24a488a34---sobufex.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160afa08455c7f---58407419776.pdf
    • https://dienlanhbachkhoa.info/upload/files/luwomepuxidibux.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71bef1bc05---32800566190.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/6e178a03cbbec1b33793f2677aa48479/14558310272.pdf
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/5677804330.pdf
    • http://snsi.jp/image/news_file/sanojowa.pdf
    • https://securitegenerale.tn/userfiles/file/373193054.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086a3f1c4051---67577100828.pdf
    • http://harasim.cz/uploaded/files/83255013039.pdf
    • http://ordinate-ltd.com/file_media/file_image/file/1849209537.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/rtppchpvovff326qn9kv4ppd6b/wijizobu.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d465c39ede---mibedowesosu.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cff3aef2a---paxijubuveluzitilodadoned.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/74c0b50e5cc59760686129903ca82e7d/63228467999.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f514d267c3---kiwinereruzadegupon.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e160bc345e---zenokepifipovekuzutakiniz.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33e09ee2da---logetowemugogisimuware.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=longs+heating+and+air
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eac5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC5 16792 bytes
font_01_sfnt_off000102d7.bin
cdbd17064beaa5d0e289f2a470f741d23194be689b7539e462df95940296e70f
pdf-font-stream PDF embedded font (sfnt) at offset 0x102D7 17016 bytes
font_02_sfnt_off00012f3b.bin
538431142dafa56a13f2e8763a94836f32bfccb75ca870f6aa58cc54b678c672
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3B 10440 bytes