Malicious PDF — malware analysis report

Static analysis result for SHA-256 478855b20f153630…

MALICIOUS

PDF

77.3 KB Created: 2021-09-08 06:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 32283c9d754f01baf7da8a20abad5d0b SHA-1: 3e762e038e46a55b14e2a8d280817aa395797005 SHA-256: 478855b20f1536304694599dee17ec06405dbbddcf4368a44eaac3cb2b7e5646
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload directories. This suggests the document is designed to host and distribute further malicious content, likely through a link farm or redirector mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • 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 https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b6cd0eb11---76062022689.pdf In PDF document text
    • https://alutat.com/data/file/gexesalevetesuxezur.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/zoxibirux.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf6eabdb53---361307982.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bc283abcef5---zopejosatejogabij.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/76584503811.pdfIn PDF document text
    • https://baptistfriends.org/media/29632628389.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/tonomin.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/13403657502.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/pavepakofofu.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/c4904626413fea604a73ee06450d3048/50615185720.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/gagoxufefigafaba.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/s4tr27v90h9odeef4or69tm39m/46811392755.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988de4bf4f0---balixuzeworafekiv.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/kudabegoluderevuwazusutad.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160826a38a502d---14058793023.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a519faac0dd---xisatobat.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202108271604324217.pdfIn PDF document text
    • https://pecsikult.hu/files/file/butapisenubow.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/85208158113.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/vozadepamof.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16111a845c4204---74435299599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=adding+and+subtracting+mixed+numbers+worksheet+ks2PDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/gubumipibafufopuxani.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_off0000c973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC973 11392 bytes
SHA-256: 018e43e8849f106cdc11bf6cb1f3626f6cc1d68dfecac9283ebbe8d364118b71
font_01_sfnt_off0000e41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC31 16772 bytes
SHA-256: 4dd7c193252be3c035a5d8d6f355774b366bbf8c9aeabc182e89c6d4a2485700

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