Malicious PDF — malware analysis report

Static analysis result for SHA-256 272adb9cf0ea1bb6…

MALICIOUS

PDF

93.8 KB Created: 2021-07-29 17:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3a39cea34860a200df860fefa59b477e SHA-1: 4dcbb8a221acc6c8d0bf6908fa33cc01f8791309 SHA-256: 272adb9cf0ea1bb68ce62813a4a8976d48fa8db04570fee327c148862e3e551b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/4413a39d744e7c53043de158b0359efe/nuvumaronodaribo.pdf In PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/penomowabanikegatatul.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3643b9d51---vegoratutaxoxunem.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/jedurinoronax.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/19590265401.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/62907593616.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/47574862987.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/jepufaporomifasufuwa.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160742fe6356e6---99577003584.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/20522865718.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/kowobam.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7a8a8ca89---85811577363.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/efdb3f746d67cfef3114036e2937ba82/xiwazi.pdfIn PDF document text
    • https://coluer.ir/documents/file/fekuwuvonow.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a600e37b46---dizerenulumemubawujatet.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/68911254622.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b5172d1d5---noravoligelunenewazudeke.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997edb814ff---93097460861.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/32708987441.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9026d2df0---mexosuteputeti.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/6885651100.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d67b813e6---26559516892.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b610252b743---71536439791.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/julipemowaruxufisoguvi.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/ce0cee4718be8151a507b7c3be9568e6/lugavosuditexomosakani.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/19980024187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=descargar+traductor+de+documentos+pdf+de+ingles+a+espa%C3%B1ol+gratisPDF 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_off000103af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AF 18500 bytes
SHA-256: 941f96c3484039cd5a0fdbbd86b077e3c0476d711aa5d8b7c64787e44a61ad09
font_01_sfnt_off000132bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BB 11272 bytes
SHA-256: 1d779d98a4d7ad062028b0bb1f4b45b9939f8231122593b50ebe00cbd4e9c3ed
font_02_sfnt_off00014cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1