Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee98535660fe73b…

MALICIOUS

PDF

87.1 KB Created: 2021-09-19 03:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c5eae4b510494f702704cb67d9d82015 SHA-1: 56170699668757c9fdc3cac034cff7bf40bf852a SHA-256: aee98535660fe73b0206a49e2c706bacd65a994974538735e71f18493942c325
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with several heuristics indicating a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://80tner.friend-match.com/upload/files/gewifam.pdf In PDF document text
    • https://indiansabroad.uk/userfiles/file/begewokafoletuwom.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/71277831601.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/61772596435.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/51416227347.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613aadadd1625---durokejubamogunako.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/gotuletemenamiraxixe.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/50322232661.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/23112276716.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/lemubafifopegipumagatuk.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/92420034767.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/zudorumivirek.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/vasid.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/juseteduwexolu.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/safinizawanasodemabawaz.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/fiwojezofimimep.pdfIn PDF document text
    • http://cevhertemizlik.com/userfiles/files/75484492989.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/45ee191fb35bc911bef9045b01693521/91090159993.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/potudemolatalimadakusipil.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161387b470d36e---17287631439.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///92412783357.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/69530798252.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/gamibapuzapasalofevupid.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/kukifapovune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=norman+lewis+all+books+pdfPDF 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_off0000f04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10865 10856 bytes
SHA-256: bcc6348381f75059462a87391f8aa72fc956aeae7a71e8886d59574dc8d5e65e
font_02_sfnt_off0001213e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213E 17652 bytes
SHA-256: 9127ee45711d681faa68c11bf5547a9229ce22015e3ac1e73b47d769783eb6b2