Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c94ca6b64f6d4b…

MALICIOUS

PDF

79.3 KB Created: 2021-06-19 15:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1df0aaf1b6d83925a65563f9837138a2 SHA-1: 519782e33be4305b2c2ba771bd837d5dd3c191a6 SHA-256: 81c94ca6b64f6d4b0c6d2487791e1c29ed6628197384b16efd3e0416c11e6ea1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to clothing designs, which could be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/7a041b5c15b710da2c0a861724eda873/57178245862.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8c8ad5376---50190433937.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c791969ff5---fukujoxepore.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/m2gbp2p2qpt3gpnmeehi32t9o1/bexes.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ovf9vlj5nauli4llbkbmkqdj15/46939845575.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608523b75a651---bowar.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a78bd9d12---88086541689.pdf
    • http://csc-020.com/userfiles/file/20210615235135_ui3t18.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609275761676d---85298650785.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/4dc5f2d29d41d4008d40d0ace6cebed2/nosej.pdf
    • http://j1medical.com/uploaded/file/wadoru.pdf
    • http://mcleod-bobbitt.com/clients/64742/File/61100141316.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830a85bbe92---puxepuneliw.pdf
    • http://agnieszkapawlik.com/userfiles/file/59495500420.pdf
    • https://aquafilling.com/userfiles/file/1543574636.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://fedorahosted.org/lohit
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=blouse+ke+gale+ke+design
    • 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://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7e7.bin
c6ac5561d76d3ee466703c36035a57b1eb6f1436bf59e6061ddd4ac178418663		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E7 5012 bytes
font_01_sfnt_off0000e903.bin
6ddf3c52ac10f0dbe7fb37bd7f9bf9b3db023e42ab1eac665270eb96e3bab1b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE903 6500 bytes
font_02_sfnt_off0000fa1d.bin
ee319e1997ca7d20624a0fcc012becd638b2f07a0e7afc43f98bb6ea6d288196		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 10416 bytes
font_03_sfnt_off00011d68.bin
53aa507d10c3a6ae943b13d0098603b73fd9d2fecd77fd6c02626ad51f4945fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D68 5168 bytes

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