Malicious PDF — malware analysis report

Static analysis result for SHA-256 a264cbbc6da38c27…

MALICIOUS

PDF

79.9 KB Created: 2021-10-16 00:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8d8d8782de2c83952d1bd7aa5ffd2e1b SHA-1: 90e7ee75ae5361fde79ed1cadb727a5c58d77060 SHA-256: a264cbbc6da38c277077c493939bb1a1b4c4c170effc3e84dbf9ab1dcc17599b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alquimia.in/admin/fckeditor/editorfile/xobopoxugarog.pdf In PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/90415059972.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/mamogajefopamowulazekuba.pdfIn PDF document text
    • http://fkhd.cz/data/img/vulubuwulikuwiv.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/cdm0u0pcj3g6k030n21ibgte9l/jamikomepexozuna.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/6440041872.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/81099382810.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210925/file/72212452667.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/pelokuxakonalujubebata.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/51032012534.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/p6ajpocvmjne6i9pn7qkpna9l8/laviwex.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/16313547526.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/sazusit.pdfIn PDF document text
    • http://soles2walk.com/data/file/pigenageramejewimuvi.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/022778d38e9d40f5f94f6a2ceb8cfd57/latemarebef.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/kifokoxovuvodet.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/xubafulirobozisemim.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/89016018062.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/14357377284.pdfIn PDF document text
    • https://envirotechindia.net/admin/userfiles/file/25757497162.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/rejufabasegopezipomenezon.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/75640314882.pdfIn PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/xavov.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/u-9XGpgKpwY/uplcv?utm_term=first+sunday+in+advent+2020PDF 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_off0000d671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD671 10576 bytes
SHA-256: 23b7e891b38aed3cae44713e3307986d5c27a0a24051312dfa8d1a1b91b18b58
font_01_sfnt_off0000eed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 16728 bytes
SHA-256: 79960e40c38f40df2fede30f57ef753ef3150316a774ac9b4ce8cd228cfd931e
font_02_sfnt_off000119e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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