Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a289f15b047cf13…

MALICIOUS

PDF

84.3 KB Created: 2021-09-03 06:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f2fc7fd336ce519a055d7a455e655a1 SHA-1: 2813ed6796bd44b6696f1b8479c300b105c6ea65 SHA-256: 2a289f15b047cf13b34c47a6e4f976b4e11a97b6fa0959e0268d8a5b8ff4209b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to numerous other PDF files hosted on various domains, some of which appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, potentially leveraging embedded JavaScript for obfuscation or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hongming-eco.com/userfiles/file/97210890544.pdf In PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/rasopufi.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/55953268515.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da573f5738d---mimubuvojedilet.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/dilobopoluzenonabufanema.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072490dca4ff---vadibadilikamebusonera.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/wejarijiru.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084fa6ae6ebb---61455842167.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1611c269b3485d---75745392152.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/zunobo.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-7-31/20210731220550694953.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/zagejinomevupemuwugepov.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/bidusukidazuzo.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/cf7d19cbffe66cbeb0a0c8bebb4dbef1/jikafujukabilujebaf.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/f37743bd0961a49da54b2fd7000109d4/49432829074.pdfIn PDF document text
    • https://rinducm1.com/contents//files/walesa.pdfIn PDF document text
    • http://pololanna.com/user_img/files/75164014664.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/67243325577.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/64075394369.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16097855a93574---28882728257.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/miboketa.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/85560283476.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/dafuwusulin.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/3cedd8d1995e90a8b0e090beecb9d44c/61661718948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=seven+virtues+of+bushido+pdfPDF 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_off0000dd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9F 10768 bytes
SHA-256: 9ee85ff95679c566d1b0ce05d8cd321795a243d889d6752e4ed8ef5af41901d1
font_01_sfnt_off0000f623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E35 20260 bytes
SHA-256: 2c6d3e24e86361ff85ee353fe0af27d2543106ba7896b783ecd259d61e5e720a