Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ef489eb63a24d3…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 18:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 24920da8a975fc89f541aa30384837c4 SHA-1: 29783aca25381d46af808b4b46e7581400bdeaba SHA-256: 66ef489eb63a24d3f71b9ccb25e157441f07e0fbb68b5aabcdbdc43ea7e6005d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://j1ent.com/userfiles/file/20210911002754.pdf In PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/25405047412.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/joropogufusuruzasano.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109161801559972.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/53906863562.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5c1f193fd---40169935010.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/3693249023.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/powigumogadiregekexetiw.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/7363276676.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210901171349.pdfIn PDF document text
    • http://dhf-china.com/d/files/divarotudejarakar.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135adb19539f---nodijakudiben.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ee5444f187452c2600665d93d25ef1db/naremaxumizedono.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/sapen.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614113fc45e53---daweruferofiro.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/61942820284.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/2990147110.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/73933875026.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/d22d9602eb7a8c86521a142c0b6fe63e/30626017462.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/2169279114.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/finakadatofizi.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/zomun.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/wowifaloduziro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=duplicate+file+fixer+appPDF 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_off0000d67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67E 17808 bytes
SHA-256: 060aa97e0f7a4aa11c97ee326b571f729a106614a7c39e213f1a014315cd0213
font_01_sfnt_off000104cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CB 10284 bytes
SHA-256: 89f69db89d39b17ebd2592676bdbd6839d9181c138fda8e4ab2f313b57fa0a29
font_02_sfnt_off00011c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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