Malicious PDF — malware analysis report

Static analysis result for SHA-256 151d450741d49188…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 18:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 509d07d6ab102f4bd1586d58b9a57d9c SHA-1: cce9558ebf070642b1022737d29d7151aeb3a424 SHA-256: 151d450741d49188a7edd094fa0a5ed0a8c90b9be991bd1c737f9d64e5aba833
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to external resources, with several heuristics indicating compromised CMS uploads and disposable hosting. The PDF_URI heuristic also points to a URL that, while marked benign, is part of a pattern of external link distribution. The presence of embedded JavaScript, though not explicitly detailed, is a common method for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://ebooksweb.net/files/file/joralukolulukavuvexepox.pdf In PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/vupivogebeborasuk.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/18449273086.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/71994483006.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132a9ddad2ac---11861214993.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/47529123779.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/78990239509.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/mofatamogopebofi.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/58846272115.pdfIn PDF document text
    • http://indel.sk/userfiles/file/14426267428.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/20367021198.pdfIn PDF document text
    • https://codecs.ro/images/file/malevoras.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/42993078129.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/watujizosifasebasovam.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/kasunitegoj.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613534104d2e6---12642699639.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/76168389970.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/70116793164.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/rixelufoso.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/suwizudagunawijilapawu.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/22099275264.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109032322138307.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/10726598015.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/fupoxokewixadosinofit.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9f4dfabb5ccec3f79d46575aa6158198/19863627844.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/kunifokuwomuv.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/wekerupivewesiwezuvibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=solution+stewart+calculus+8th+editionPDF 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_off0000d675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD675 18300 bytes
SHA-256: fd2727e88145a91e34d16d2305117901409d882545ca51823371c70971ddf163
font_01_sfnt_off00010712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10712 10936 bytes
SHA-256: 9f3cdc7f39f647b08dcc74201dbcda92079ba2325a9b729c77ea5b1dd2d53798
font_02_sfnt_off00012067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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