Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1525725bb4aee3…

MALICIOUS

PDF

89.0 KB Created: 2021-08-08 03:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 329a6a67e62a696aed471e95f443de20 SHA-1: 50d40607a2adc5d1bf88e33dcb297691bcc67a36 SHA-256: ef1525725bb4aee310eacd3f05fe28888ddac868395a98a9d396a99a36f7f216
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and compromised CMS upload links indicates the PDF is likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://irlanc.ru/uplcv?utm_term=como+programar+un+control+universal+rca+para+tv+jvc PDF link annotation
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce6278a424---96300769177.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fododozatawavalavunifoki.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/5bf7f447a1c09452c4846e0f540df212/75741578853.pdfIn PDF document text
    • http://prociweb.hu/sites/files/file/pawofokeril.pdfIn PDF document text
    • https://assistenza-termica.it/file/mazavesux.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b453c09d8---62394531062.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/99450989865.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/lajajulabitovobinowofunak.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b740a876971---25055341453.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/9535699084.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210627_62AE8B8E72181EDE.pdfIn PDF document text
    • https://dm288.com/slicice/file/2204551781.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/nemaxujufaxutat.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/6d42e526b4f1661f979e61398c55bb03/xasuzefiwafojo.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160754c03e6350---xisemijufo.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/fe5de9b0fef925cd6f3dcc442b62b439/gemoridu.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/juwajaxewezatafemovapo.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a07ab9354b2---52766117724.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/53502981786.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/1588f8fd9af9f9791ae6fe73a8b80288/sorefetuvoridoniw.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/pivutukunizizule.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075c6aec2490---dofimalibututu.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/643519d328d062331db4c46edb9074c5/32429895283.pdfIn PDF document text
    • 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_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD1 17656 bytes
SHA-256: dffc97979ac1cdf1eff66d56633042f86573ad9156f6e158ba538f374b8be904
font_02_sfnt_off00013992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13992 11044 bytes
SHA-256: 8b7071dd82bd1a866a1a762757912879bb4c69dcdd51a60368bfb5e219b12a45

Open this report in the interactive analyzer, or submit your own file for analysis.