Malicious PDF — malware analysis report

Static analysis result for SHA-256 410f97169a8ecd01…

MALICIOUS

PDF

69.1 KB Created: 2021-06-23 05:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f30cba8619402358be13eff8d9db4884 SHA-1: 1a840b1e45bc68cfb3d17d03b894ce50317a396b SHA-256: 410f97169a8ecd013593ccceae1de4125cfa4bc8569b76ee8152f775ed66ef91
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to potentially compromised WordPress upload storage and disposable hosting, suggesting it functions as a link farm or a lure for downloading further payloads. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ylgems.com/file_media/file_image/file/beguruz.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/h1iu5lkpgn8tlt4n0esn656ts2/50566278969.pdf
    • http://kadh.kr/bobod/upload/file/15651904791.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160885eb43e2cb---riwimasuxemapose.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8c46e42aa800d0e061424ee85b6f37d8/xexarowikofagan.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd163c9e075---gapanimezaku.pdf
    • http://on-video.com/movies/movie_data/file/62144479498.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nvjccghc6r6g4c878so2n2rlv4/tiloziwarekuzunig.pdf
    • https://eviinstall.com/userfiles/files/lebaxuwudu.pdf
    • http://www.annaleehuber.com/content_files/file/15955336218.pdf
    • http://lica-mpt.it/userfiles/files/rivedodofetomo.pdf
    • http://outspokenholland.com/userfiles/fckFile/20210618191930.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8b28477f---11132970737.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/f6rra9q1guj330vvlbr1945061/kijelibinuke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+assassin%2527s+blade+full+book+pdf
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d092.bin
80f00b307eee581effc69d0e6a0e95ae9b8840e6a02bce9b37ee53cfed822496		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD092 5220 bytes
font_01_sfnt_off0000e254.bin
d4e588b8053536562647b143828ef362e4bf70002349308fe80de19c62dedc21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE254 11060 bytes

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