Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9dacbad86c7c81…

MALICIOUS

PDF

59.9 KB Created: 2021-05-29 14:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04db682b198c963f9f4f9f55e204c5bb SHA-1: 2cc5df2ff49d7ace53304dd9e5447242a5b768ea SHA-256: 5b9dacbad86c7c81c76063c73fcee85a1195e7c48f67e90bb5dc546bac08dc39
154 Risk Score

Malware Insights

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

The PDF contains numerous links to potentially compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common phishing or malware delivery technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8151

Heuristics 5

  • 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
  • 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://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a2f5b9e3b---56136687055.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/2u778hdv96cdlfpaj1blqlo77k/venipizadelipalazer.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/59b587cf3735005b99a0f2437fa2fe19/moliguxa.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/89425a4ca234c2bc0b8c982eab8ac984/75613211809.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/n2ek5bi8v3vguc0q7icukm70q6/sototelolovovek.pdf
    • https://apskarota.org/userfiles/file/podenagepubekev.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d5bb2bf32---50271648391.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/67e8062fda22ec99aa4120ab82c8a81c/51423929532.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799452a1bd6---65662582967.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/a035af61001145dff1d307bde7916e89/pazukavelagopapelul.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdf60678e1---zubipakevenupu.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb094ba69d---52773133456.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b38d97b76---xumeporerujawobop.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16099e901648e1---2044380934.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/pq2u9q9sg4dlve00ojmadlmse3/fijuvutuxotaj.pdf
    • http://meteosputnik.ru/userfiles/file/85344392784.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/9usrbf8ean3e6fupqqcahq4r1h/42911624972.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=mindstorms+nxt+2.0+building+instructions+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9a8.bin
be77091a224e25e297f0853dd55ab8d631efef2111a3cdad22827e99ea197f9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A8 5784 bytes

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