Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3e28fd13c28d02…

MALICIOUS

PDF

74.8 KB Created: 2021-10-01 04:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0d643950453d7ecc508818d08f7bd16f SHA-1: b245d54791352c7cb311fdcd71e549040e287239 SHA-256: 1b3e28fd13c28d0274e9fd04b204e77a2fb0334bed0cf0eec8d42ad109f26c8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to link farms hosted on compromised CMS uploads or disposable domains. This suggests the document is designed to lure users into clicking these links, potentially leading to further malicious content or phishing attempts. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://towa-aaa.jp/userfiles/file/bekopadipuwenojabak.pdf In PDF document text
    • http://citlak.de/admin/UserFiles/file/getuxijoxibepomave.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/86501315223.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/pabuwikekakovu.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/retisobafofezevit.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614784d7ccef0---99800780586.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/5324960522.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16150b20111a9c---58787566052.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/nekafobedifodavip.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/bolaludinapo.pdfIn PDF document text
    • https://etadelloro.it/images/file/tasas.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/19603761797.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/retazifenum.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/nutokefaxudizawogu.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/nobewadonisidawofapox.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/kodumakob.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/xofizibabobil.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/87397165595.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/sikegofejowubenirol.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/efcfcbc24ca9689ece18deb5fbd48640/58777606401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=atomic+model+of+erwin+schrodingerPDF 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_off0000b747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB747 20256 bytes
SHA-256: 6e1b1b9c47961210264e1f802434ba63980033433a463f2f0d059c6d198ee2a1
font_01_sfnt_off0000eb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB99 10828 bytes
SHA-256: f44cfceb31d6ec7a81b5d830c6fc1f39004c1ee72f34adcccd7e0029da425184
font_02_sfnt_off00010438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1