Malicious PDF — malware analysis report

Static analysis result for SHA-256 959f5ebed1d2b954…

MALICIOUS

PDF

84.2 KB Created: 2021-09-10 20:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e28e0ec7957771ea0f6204957cc67889 SHA-1: 9c859a68dd4cacb27120090fa8381a07469007a9 SHA-256: 959f5ebed1d2b954e663c5b285bf9c4b8a6d76503dfaa90a8139896692e4cbc2
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. It also features a link farm pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to phish users or deliver further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://textosolutionslinguistiques.ca/upload/editor/file/37139862925.pdf In PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/dotekawosinefivelajoz.pdfIn PDF document text
    • http://www.moyekolodin.com/files/19880904173.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393fc61471a---lowikeniv.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/5426580814.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/bitepoxubasiripaxovilapo.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/dilobipobowimofitefafe.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/vuzasilibatomevozire.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/467dd624b6518adff3213294dc399fb1/7114152575.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/bimegaxedelubirudubap.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/jafunimidibogad.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/82937935645.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/27142773474.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac876528cd---nowisip.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/sexofusonejavokibon.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/surowo.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/30479196156.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/velezibijux.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/givegazuzalunemaguna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=volume+apps+for+androidPDF 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_off0000e776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE776 17020 bytes
SHA-256: faa5318720be00db7864a82dc3bfd6469780e033b2a4ec4d80f9fa1f6bf3258b
font_01_sfnt_off00011357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11357 10632 bytes
SHA-256: 789f4c1e77b0eb719aaf6ba8b759f5f6239ff09b56798d32af173b2bd55324aa
font_02_sfnt_off00012ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1