Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31cfa940bc29e3c…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 11:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0462a5efe12674c90b204fa31a880b3b SHA-1: 00593c737888a68c0fc3c75c499dd9d291492928 SHA-256: a31cfa940bc29e3c4b9a8fc0cdaadbf266c242be9a975fef40a761d666f07a67
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Multiple heuristics indicate the PDF acts as a link farm, directing users to various external websites, some hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/gezanagukapupedono.pdf In PDF document text
    • http://nedirajtebosnu.net/userfiles/file/botosidun.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/xozomenutowivupuwaduwox.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/73902809161.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/wipiraped.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/47984409205.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/16908302544.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/ragijisowoseta.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/dobotosizew.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8835b1799---41945724408.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/61190101241.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/62448778032.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/2a31f32644fda5b4a2f62048ac716083/39536352718.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/736e7d3164256654c99158dce0e6aad2/nexelivopi.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0b8a2dcdd---janak.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/24630743493.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/63202237641.pdfIn PDF document text
    • http://rc-modeller.se/images/file///pisefazefarusejav.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135e480c1577---zurutobuvikupojugibo.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/33726481919.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/70620435090.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3492992502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=romeo+and+juliet+questions+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_off0000e091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE091 16836 bytes
SHA-256: e41b356f0999b3a7cc8732269151d6d962566026e1aadf0843cc544ffc8b8c98
font_01_sfnt_off00010c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001245f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245F 10980 bytes
SHA-256: bea64420ab6bdc78aea47322afd819caf5b102fb935827615d527ad8090dea8f

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