Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d758e54b758745…

MALICIOUS

PDF

88.5 KB Created: 2021-07-04 23:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00b554da5987c433452b977e0b011799 SHA-1: 7346a57e1fbd0d235dfcb6019b5a66db99c2d47a SHA-256: 28d758e54b758745d309077ea1198da8a691f1e88195a51aab0945047ecefd7d
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary purpose appears to be directing users to potentially malicious content or phishing sites through a link farm hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee8a31c4fb---favigutabarube.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/2ieua46s0rep93mctgfk7kq40b/muxajanemefurowapatanen.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/cc3b665479f11d71f153b9c921cd14b1/toxotowawutasokotejo.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa63a7792e1---zexowozubipanimi.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160805c28bff55---81719391456.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073d9b2d58c7---nalilosiwijudamidozaxeme.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe2525513a---wubufo.pdf
    • http://greece-ex.com/images/blog//file/17940647167.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/6c116aab58628dc7330ccb73b1046b12/25973295320.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b531254efd---dawibexu.pdf
    • http://debeleven.net/UserFiles/File/10686266724.pdf
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4721160997.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/jcre67f2g3nfr53mmkujrmjeit/3786202575.pdf
    • https://devcons.org/uploads/userfiles/files/xifutexoseza.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/98af2b101b17eb6c5e61235235332c65/pazevosujimosal.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/2bathi7st0jht1vjotmhgkna75/62124403758.pdf
    • http://akcjonariusz.com/UserFiles/file/vabamavogesipelejufixamu.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095082f22bae---modexepoba.pdf
    • http://ahchala.com/img/file/degadiwelini.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/i3p4fhien6gguv2lfmq4nvrq52/5576611632.pdf
    • http://phantasos.org/userfiles/file/94297823826.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6a5394a2f---23158327694.pdf
    • http://bestbuyfromindia.com/userfiles/file/88297932347.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/goksg55jmkji7e1e1561sldol3/leruvufut.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d2f55a4cd---80226869027.pdf
    • http://ahkkpcm.org/userfiles/xowulezal.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5fceadb62---pabojokupilu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=logical+reasoning+deduction
    • 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_off0000f3a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 16792 bytes
font_01_sfnt_off00010bb8.bin
f1ac40af38ef02d45decdec51941042199216698770919be33a1d110cd9c8c2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB8 10604 bytes
font_02_sfnt_off000123d7.bin
8c96c545e71d2b550e36ad93c419c393fa7a0bac9ef53c8cbc3e738301dd1e23
pdf-font-stream PDF embedded font (sfnt) at offset 0x123D7 17928 bytes