Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b80dbe9a9b784d…

MALICIOUS

PDF

82.8 KB Created: 2021-06-25 19:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6a891affe080a72195d3be7d47ef0ea0 SHA-1: 8ca76695b7bcddc8222ba815d47138bbcb6bff7f SHA-256: 65b80dbe9a9b784d1d90549119b0d8f841e65d071a8c53286049952a9228a13b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or initiating redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/0f0c586f442ad90ed9bcac28ea0ae7df/wumimarojezoloxokonezoxop.pdf In PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/jepexekafalonumamu.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/20229981424.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/38ff2d680e7c81faad8c6d4bd2c8e62a/47068574429.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/d2cea715905c7f88f321f0c5f9e68d81/ximeg.pdfIn PDF document text
    • https://tavio.ru/files/file/wulupemopuleremonupabi.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/sagilaxudidasen.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/temago.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/61421939213.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/21226428665.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210523032603.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e67e24fd098afa12ea19cc6d07fe70fc/moxiwulaji.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/52630133643.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16f3b9b1d4---39330391917.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a66a6515729fde6d3f6eafa5e1ab6280/91914099709.pdfIn PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/talubigevovawekapemub.pdfIn PDF document text
    • https://littlelightnepal.org/userfiles/file/wibonamupikelusolugixuwa.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/nalisixanonife.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ad9917cec---kekafofubawepo.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c287e6153c8---mebowijovuzasapis.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f32322a4d---zowoteg.pdfIn PDF document text
    • https://x-software.cz/data/file/tumimugafuzokovoja.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/20084062762.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/71998500183.pdfIn PDF document text
    • http://emannsltd.com/userfiles/9978875530.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/0ef953e6d8e0a67d22875f55e0437db2/losijerurogoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=inverse+proportion+questionsPDF 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_off0000de72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE72 10300 bytes
SHA-256: a45e03d98da812ab4ec9e49b3b9eff37fba242f215786c778d533e24c72f4df2
font_01_sfnt_off0000f5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE1 17856 bytes
SHA-256: 989a14e142c2040fc16c8583f1815d4103d1fefa09cbdfe4d6fed331e7849704