Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf9b3dae151dc1f…

MALICIOUS

PDF

76.5 KB Created: 2021-09-16 04:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1e825df12dab30bb515933d58a4c36d0 SHA-1: df67e0029f8051a5a1316e6a71d54ff7ea127eaf SHA-256: 2bf9b3dae151dc1fa84ff26bf0def2ea39d0b2db19944345fd9483f9693012ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Heuristics indicate the PDF acts as a link farm, pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the download or redirection to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://abnicum.com/files/file/kawuxaz.pdf In PDF document text
    • http://mutitar.com/user_img/files/84011007906.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/259090bb2378dfb5d977328c8b4da6e7/86002118935.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/33834378764.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/63367024666.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/tejijo.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/7584133499.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/47709348379.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/xigimozake.pdfIn PDF document text
    • http://synowka.pl/galeria/file/surukopevimetotapazix.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/riferidimawaduwafezojiju.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137587f50d76---24614624288.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/fenoxotalemibozanobiwa.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/zivukus.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/90239229347.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/59370374853.pdfIn PDF document text
    • http://pbpharm.com/upload/files/tojexasofep.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/46237572533.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/82345055223.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140e94145694---nonixuwedoziwawakumakow.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/dinewoxot.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/lepubapo.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109101552556027.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/wimojimovufesikikazezisov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=suppandi+comics+free+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_off0000c5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EE 17436 bytes
SHA-256: 402e93861e8d97c0d8f5300cd31028a859437d81692113d126496cfcb68b93fc
font_01_sfnt_off0000f34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B63 10812 bytes
SHA-256: cad483a11df9ec135ee79d8d8b8534cd785181bb73f656f771436ec6d8f0e869

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