Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a24120d78f0e27…

MALICIOUS

PDF

68.9 KB Created: 2021-09-24 23:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 44e8e676b7e732a753c92134ebc0d49a SHA-1: ea9c88af72979b8cb169d747b47eb5c73eedfd76 SHA-256: 65a24120d78f0e276fe0673c048e66ebea306d86a14a1763e6ced5749898228f
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613601644ed45---xelowadab.pdf In PDF document text
    • http://levant-tekstil.com/other_files/File/22871342437.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/masuze.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/vubaxuz.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/88947174155.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/73504730834.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/13957730846.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/xuzezesan.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/95380638546.pdfIn PDF document text
    • http://air-ned.com/uploads/files/22381698876.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614366c9d9c0d---jolovifu.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/43078259539.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/nupetapufe.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/36143085582.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/002be80af35d1a37142d5521c24d0a1f/87080253772.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/16892171206.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/86504315525.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/diperav.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/vejokoxugitofule.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/82108887756.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/13811510787.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/vowaxageno.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/19756259193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ice+planet+barbarians+book+1+pdf+freePDF 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_off0000ae8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A5 10848 bytes
SHA-256: eb63707a87e3a4428443dde14b936d1217223546ac1132a89f29425ed5c7de28
font_02_sfnt_off0000dfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA1 15160 bytes
SHA-256: 2752b007e5ae9e9785ddbc88f1fa29f67e169872c514547b31454415ce3c2df3