Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf1ca0980be840e…

MALICIOUS

PDF

87.9 KB Created: 2021-09-11 14:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 948081754c24118122bb3f343d40d0fb SHA-1: fb7b1ef20f2961a95c469614716256e60987ce52 SHA-256: edf1ca0980be840e38cc42969c47d67a58b54e4961c67b7c2079c53864aaf313
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The document body, though obfuscated, suggests a lure related to university applications. Multiple heuristics indicate the PDF is part of a link farm hosted on potentially compromised or disposable domains, aiming to obscure the final malicious destination. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://thanhnhomdinhhinh.net/uploads/files/95852207903.pdf In PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///15099005018.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/supimirozojade.pdfIn PDF document text
    • http://videlec.be/ressource/file/51183860315.pdfIn PDF document text
    • http://bjjiffy.com/upload/gomidebodasuvaku.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/mukubapijilonularagim.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/lejexotol.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/37140185487.pdfIn PDF document text
    • http://gapp.fr/medias/files/19186679049.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c51987279f---fevedepijozav.pdfIn PDF document text
    • https://tpk-m.ru/files/file/63619998863.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/91153152334.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/noguxot.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/8512189531.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/jozasulanid.pdfIn PDF document text
    • http://berbun.com/user_img/file/23976137709.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109100946424648.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/dc4a3c795b1ee931ae7ba6fa2247c751/95496321116.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/70365892997.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/nuvofipezekujotatimekavi.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/bolunixi.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/d419278f63ec21e458dc2310577b049b/zukoraxalaxaz.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/fogipezegusoloset.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/72067322379.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/garubujegiriwitoxoveja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=motivation+letter+for+universityPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7b8505373d68f0305cb395400b47bbd3/ribebivosevowadiwajaje.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_off0000f2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 18180 bytes
SHA-256: 4728beb5d3d0086e2645e39cadde8f420d1615681b977c63034bd3d3c77c3f6e
font_01_sfnt_off0001219d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B4 10480 bytes
SHA-256: babe81e325ab80e2013d010f3dda9b746ef4f5f7b412465964addd9928fca5b1

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