Malicious PDF — malware analysis report

Static analysis result for SHA-256 08148ee56cd0eafa…

MALICIOUS

PDF

87.6 KB Created: 2021-09-15 17:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8dc6fca93230808d05f9d42ddb47d028 SHA-1: 37231a24f411aed00922e4ab57ec8005e203aed9 SHA-256: 08148ee56cd0eafaa0cf2e814e0d3651063686f75f7fc86bb9fbcf19bf349d86
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs pointing to various domains, many of which are likely compromised or disposable hosting. The presence of multiple external URIs and a link farm heuristic indicates an attempt to redirect users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://avenue102.com/uploads/file/pefinelululin.pdf In PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/wereviki.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/70220810092.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65751166687.pdfIn PDF document text
    • http://sieuthibds.net/images/files/resadutaguma.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/viwegevumesujab.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/86796891827.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/lakusi.pdfIn PDF document text
    • http://zerosquareonline.com/file/30492664192.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138441aac4e2---93032649425.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/49066723191.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/wigazevefavezakasiwijad.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/51611548348.pdfIn PDF document text
    • http://esistore.be/userfiles/file/37314425115.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/juxumusuve.pdfIn PDF document text
    • http://sudeoksa.org/userfiles/file/20210905174903.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/soomjb8tengriums6mtvd0j01k/79571834861.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/52380948996.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/wafamekamed.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/nnreikrm36idcs0mj679sg9nhj/vimefa.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/87101662596.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/6912738944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=live+telecast+movie+watch+online+freePDF 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_off0000f37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37F 10712 bytes
SHA-256: 3dd68b86c6673f14174e1d0a48a36a870650e8c6b75edce0e813fa01e33561d8
font_01_sfnt_off00010bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12409 17596 bytes
SHA-256: d4afeb15d294d8e7267f4c725f60a3948d5313abba77bda9e8d9c7480590cba0