Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a516568da394de6…

MALICIOUS

PDF

73.5 KB Created: 2021-08-31 01:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a01393ef5138d4ebabb45beb874b4bff SHA-1: 9c3b72cfe1e8436686adae89521cdb436dc877f7 SHA-256: 9a516568da394de6ef7116846806f1a53acb26dfb95c79d7ec4fc2f23e9b16e4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of multiple compromised URLs is a significant indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160e7a36f14dea---41859165407.pdf In PDF document text
    • http://dkkarsin.pl/img/upload/files/sorafogijasoruwizaju.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/66fe14f849998cecb97a079eb301b6bf/xunonux.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/56183592295.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/qucul069195m44jrig97n90trq/lowamewutajunijofusuxo.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ta2mkefmvjiq7g2ubo8rnbm713/79031631794.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/100256aebe2239d4ca937abb409d9751/53226918706.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/14030135081.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/27368390930.pdfIn PDF document text
    • http://alakharia.com/public_html/userfiles/file/48919762336.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c95f7deaf86---fazuwaz.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4f5b1c3e3---48465446939.pdfIn PDF document text
    • http://juha.be/_files/file/64178635864.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5dc40f273---zukodepitifuva.pdfIn PDF document text
    • https://ancoraeducacion.com/images/tageluwuzedu.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/fafikiponu.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b27e0757363---30373153943.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/satemevozubif.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/28910494012.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/d7b0bda1b8d13b6b1fdb56b10bcee6f9/nogosadijobizitemaje.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/82019979949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=logo+quiz+level+1+answers+with+picturesPDF 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_off0000bad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD4 16952 bytes
SHA-256: 78adf68e4a79377ec4fe22be186e7848e61aa91bf4d6a58d10f6c6f904a0673b
font_01_sfnt_off0000e6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF09 11120 bytes
SHA-256: 0734cb52282f9fea0bfefc006d9582ffb8441e6fb7b04b47a7c711d56e0c5da6

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