Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7b32e3f6e37c59…

MALICIOUS

PDF

78.3 KB Created: 2021-09-02 17:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 38ba1925aee22a3e0b498a5c628878bf SHA-1: b967b6ecee8ca48d70664e784c46359906f4d4b3 SHA-256: de7b32e3f6e37c592ba73abe27365612db87a390815adcefa83e99efe77cb0e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to websites that appear to be compromised CMS uploads, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://jfhconsultancy.nl/userfiles/files/24310044309.pdf In PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/punipenezenogadapo.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/14dql5hstnpgitlqrtpcpsp4b2/sevanasavupi.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160802269d4e78---82043974570.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/6ivqe22vp2tm42orminpqdvfih/58704477318.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/dodujafoteroxosito.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/moxozibobudokevinomovig.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607831afd0d09---tiwovijevavekov.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/51608865856.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202107300812041430.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/5b9be0c90cf6f8c4c5097d3a38fdaba5/vapabosejazonesi.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/32226700717.pdfIn PDF document text
    • http://medipharmacompany.com/userfiles/files/besojajuse.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/19014245172.pdfIn PDF document text
    • http://alohatoypoodles.com/clients/1/11/1122824db0f83c9e74cf39311881f217/File/penerivebafezunidakapotuj.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160b48a1211561---95347213564.pdfIn PDF document text
    • http://yuha.be/_files/file/zorovezexevobiroju.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d5e0c434c---disasizekavozuwakejipaje.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/kowematud.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e74ae2e4b314375f3e4c516baf67ba99/fejujofetuwibubevimirewe.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/nijunun.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d09c6d80374---xolip.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/23561190891.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/oe9jgb74io16bar4e8stj7meot/bavuzexujenalerik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pdf+reader+apk+less+than+1mbPDF 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_off0000cf4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4B 17104 bytes
SHA-256: 458df65eaab6af5f19b9742d190f7ab9bd887317161c56a6195dee5d4a7e5ffc
font_01_sfnt_off0000fb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11355 10836 bytes
SHA-256: 126d50d22856f0a5aee0147727326445b8c40c42bcc67bb95ab313f20640f5cb

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