Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db24fd8ee45cbe0…

MALICIOUS

PDF

94.8 KB Created: 2021-09-16 01:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d9e1026dcb95cb61a58c8c9da6ae17ba SHA-1: 2db91e3e6f298feb7c89903045ead48dfc42f4f8 SHA-256: 7db24fd8ee45cbe001ffce4dac3b7448b47bd82df57f48193763fc087887cabc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple heuristics indicate the PDF acts as a link farm, pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://chcial.ru/uplcv?utm_term=naruto+the+last+movie PDF link annotation
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613458fb74172---31259489581.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/mekebetu.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/62415891558.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/fevisubizizote.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9a958d5c7---jewawejokutedudulukudibep.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/weramexuwozizalana.pdfIn PDF document text
    • http://taigesw.com/upload/files/puwuketexitazekirarawe.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/11829148ef22d3b92caee24690594af5/65383683530.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/14263783743.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/bemidid.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///danoruvo.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/83878861428.pdfIn PDF document text
    • http://baoveantam.org/upload/files/86007863682.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/jomekeferirasetiserag.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/63725227447.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/midapixudaduzuguriw.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/najenaxef.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/paxedokogunowevoju.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///74886535566.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/suvomamiw.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/19436688846.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/devumefuvamovodo.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/88875661695.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/32711980408.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_off00010fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCE 17800 bytes
SHA-256: 8a77ed8d727b212ddab8e36c658b015d29343e1b29f96d67a293650fb4d0df47
font_01_sfnt_off00013e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2F 10412 bytes
SHA-256: 35403e051203f0791c0caf8af6a27ddb37c748a14c3f61031287642637a5f518
font_02_sfnt_off000155d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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