Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb3f750a711aae0…

MALICIOUS

PDF

77.7 KB Created: 2021-09-24 05:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 223b14f558556e994154d54da71db1cf SHA-1: 18ed0c21fb9358639c4eb46cfc71e3deb6ae9105 SHA-256: 8bb3f750a711aae0cf8014af28c4234a377dc5e6ba302ece92c378a23b840ee2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://irlanc.ru/uplcv?utm_term=download+snaptube+app+download PDF link annotation
    • https://turbooto.vn/upload/files/xalezorelesati.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ac4bf9c99caf0b822b524944d37978d1/96527710729.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/75216620503.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/7515297456.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/vasekimoke.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a732e0a7e4cd43722354a3d7de187757/tugagigijanagevuleliwidu.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf6cae8b50---ruzevuxazusil.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/29370869993.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16143a4b45e746---jajijizumafu.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/tafibirime.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/17287235117.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/xatawizelakom.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411bb2c86fc---fujemelodogiw.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ui17sqmrlehnv4b27kaf4rnep6/99602931897.pdfIn PDF document text
    • http://acelybio.com/upload/files/21683952023.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/54070097934.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/ragadetenizuxadalasi.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/gomadavupebasemaleboxozeg.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091601345273499.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/59769171777.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_off0000ccca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCA 10520 bytes
SHA-256: 786b516f99947c2a203c377c7dfe31fecf993b89ac75e517632127e7669b92ff
font_01_sfnt_off0000e4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCA 17584 bytes
SHA-256: a511e4031c66dcf7193f8239ed435a80695a9651720f07a86db5cba2ab70911d