Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ea6c7ac612b089…

MALICIOUS

PDF

82.1 KB Created: 2021-06-10 19:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: aa69033384b32780ac04bb58932706bc SHA-1: ed49d93328b42f739efb48e574da5654261abf7d SHA-256: 22ea6c7ac612b08910f49f04f642c85d097836446e9ef2e000b47771fb83d955
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be redirecting users to malicious content, likely for credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=elephant+electric+fence+circuit+diagram+555 PDF link annotation
    • http://cnex.cc/images/blog//file/zapiwibamelusovo.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4deead21ac---63333885710.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aae86caf618---lupofanesukuregu.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8c535e8e2---pafulegigupujetag.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/86953053413.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/xubozipaxege.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/64056783784.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/dsck6lmou4buun4aeh2qt7d0jd/78240589804.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/60hm2jm4p1t10u2eep8epvop6p/57090790179.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/j35sk9oid2lgbh07u7mkdo218a/38072292251.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773c8fa39c3---kigavebuxunomumerimila.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fbcfb974e---39727262134.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/43643320494.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/a548bb02399fb27614b0d2fcfd84fcd4/40697187390.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa62f9daa38---famamepadilonepufidijux.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/lfja7bupuj8c5hn4f47d6o6gv0/99364150871.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ff549c92---xavisizulagorozurixa.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/guwudide.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160717cbd06d30---luxawik.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/2dh97jigg76nohgh7b63khuno5/tibuneluxutaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10015 5472 bytes
SHA-256: 5dce02152713f5acfcf16a260edce54b1ece1cf93caa0db7ee96596d6a3321bb
font_01_sfnt_off0001128f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128F 11536 bytes
SHA-256: 25472a0939aa3f037c121690bf0d619cba13d9ec79ce7367a79251d0a25c86fb

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