Malicious PDF — malware analysis report

Static analysis result for SHA-256 e15146282e781819…

MALICIOUS

PDF

81.3 KB Created: 2021-07-21 09:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c2159b358ae1c25a2e1ce7354cdf2c5c SHA-1: f5e78bc3aab6a2887e36f67d7f392d4deda70553 SHA-256: e15146282e7818190d40b09c02a9bd69dbe5a1e422a4d3297d6414ca1204323a
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites acting as hosting for other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/bivorimaxikizosuko.pdf In PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/a19c2b80176da6ada23b7b9565888ff9/ludokoxukazaliwegim.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/c03f62bda83c5c76caa033d5bb283957/kotifukuliniwoxabigo.pdfIn PDF document text
    • http://linza-market.ru/upload/files/pitokufukudivutigedivupav.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/iji576m2c0uu6e21q48i09t7j7/kanedilurobufakibit.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/29873429042.pdfIn PDF document text
    • https://12tiga.com/contents//files/96556945612.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/23d948e5aac0cf37c5dc1c0e9ae7a701/61668140292.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ftldum4o6unvorbtpj7dglt9n/77415505952.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/tepovakukunosaku.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbcce5704e---2287999977.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/ad2bd4a17d946e755f31e21921529356/76365758060.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/7217062846.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a94e6cc8d---muzesojop.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/25485491623.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/48ed6afd0ed4f84af4f9db48b42ea4e7/41251958667.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/tives.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5da93e549e---rakamulexobon.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/398514072.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/6kqno37gt2utkv8qh18c2dti50/tefasonidegonu.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/04e2ff3c0066f5deb309542fdf942f86/44827718017.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/90971247490.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/a0b6abadff48a8e42e49dd7aa3fb3428/negoxurisetofabapametonux.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/ei2ii2vqvot4n1qkvoqldgvf4o/75764453871.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c6d5ec94b---migurogotugi.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/finuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=3+monkeys+bar+and+grillPDF 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_off0000d705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD705 17776 bytes
SHA-256: c07dbf61059ed652ba6e99c5cdbbc0fbe6638b2b00e294c8b1f5437b26e9bfcb
font_01_sfnt_off0001053a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 10912 bytes
SHA-256: 7398b8964193e395fd66dae139a88af97449e0c71c03ed9b86dc55ed236e45fd
font_02_sfnt_off00011e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1