Malicious PDF — malware analysis report

Static analysis result for SHA-256 1afce99b0e64ca4b…

MALICIOUS

PDF

75.1 KB Created: 2021-06-19 06:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 07e612b4d22b4000d425edde9b7a3907 SHA-1: 29a4c7a4c747f3806f4c814d7c2106d49456df87 SHA-256: 1afce99b0e64ca4b3cf0091eb60e994ae074c67243b52bf4cb696990200930b4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF document exhibits characteristics of a phishing lure, presenting a fake CAPTCHA to deceive users into clicking a link. The document contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to distribute malware or redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ukgreho9oamfne60h8fm1jptv1/sofadarenixo.pdf In PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/82794403752.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/pivelo.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609847466d048---38488622049.pdfIn PDF document text
    • https://kajariaadsevents.com/admin/uploads/file/19151262857.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/krorpk3ublsmdc5ocop1958s0b/55454902523.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/oj8h5lokbktmijb655rs7hqjn5/duwonidalujenexatoluduro.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/8oq43q43do4v5lapqu8dnspmho/minamupazilurufonelodafev.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/e7iemtfi1hbg308saln8rjl5sd/pajimopuzewik.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/eea830a742b6bb1e60cc219e784d7868/pexinusowaju.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/52923065331.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/68133009876.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/gk13h6k07diq8oqb3s9biqnli1/lasezutitixuvaxo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ln1j22tjbqom4vnubklpjqse02/41642700501.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/ac9ec1ead77be831f4fc8f82b94124c8/gaxaxu.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16079c95b38880---vokudebepen.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file/%5C/84934707708.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/94294311208.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/wevexobasuviwuf.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/24783cc28e98e00e36fcd5166a44ec00/lapamekezewuwib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=frp+bypass+apk+2018+latest+version+free+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B3 5968 bytes
SHA-256: 161695de316f74df5e404a84bd169c1406a427ebc985ac38c64c5cf4e60b5817
font_01_sfnt_off0000f532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF532 12212 bytes
SHA-256: 55bb97fbaee5f647501fdac532a2007cd0a35cbe32cf13ba8b070522f279bb03

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