Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40d3ccf3c38c6e5…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 21:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 12111f4e32987bc10a3cdb10e8b72386 SHA-1: 3d05c371beb62bb5184645a807df1e951a2fa4c8 SHA-256: b40d3ccf3c38c6e527fa9d3b45a3f159f0c96ed1af5524bdd94c4bcf361e2a8d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/59133aead0c59d95dcececcfd3399b16/xuwilaxopefasinizifub.pdf In PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/74971229747.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/58692182427.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/17202774174.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/7dc0bd4e8c9762fcd0922861db64b2bb/80366593403.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/68914909357.pdfIn PDF document text
    • http://centronegozi.com/public/diven.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/46744534446.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/kejonimeravazagavor.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/daxutozipanomiboxejobose.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b8e65a3e2---lubebokimomupobet.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/dimoratajawito.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/08/files/210819214537.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/nujusubomitebenesiwonilo.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085fa70ecd02---madaramozixajudir.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/04a0e3a4c926ada5808e6bcc8dee5301/fexav.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/javatefuxiva.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/16336972040.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/61803488989.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16129104f17dc2---60060673009.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749705cacb2---99900859398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=basic+of+civil+engineering+pdf+downloadPDF 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_off0000d92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF146 10904 bytes
SHA-256: 0c58a322bf0a56b57e57481fd7f41930d08c46899288e2c4835ec958772686af
font_02_sfnt_off00010a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 17544 bytes
SHA-256: 7cf2558c9c18fa7087e97d9b4edd4fc71b885cbb5c15803ce04ec77fe798cee2

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