Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21307e0bfffb1c4…

MALICIOUS

PDF

65.4 KB Created: 2021-06-11 13:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 292db893f769bda0ad2462ec8615986b SHA-1: 0b24e5980ef541f69fb55e09b6ea3f9a15f0468c SHA-256: d21307e0bfffb1c404dca46b0c54f344b3451c012c3436e4649b376fc7664950
154 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The PDF contains numerous embedded URLs, many pointing to compromised WordPress installations, suggesting a phishing or malware distribution scheme. The presence of a link farm on disposable hosting further supports malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8570

Heuristics 5

  • 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
  • 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://philabc.ru/uplcv?utm_term=lincoln+riley+offense+playbook+pdf PDF link annotation
    • http://sieuthibongda.net/ckfinder/userfiles/files/xufilu.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609464959e0ab---logomowujukep.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160761d6e9ec73---24887848687.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160725591328ec---netenofakexapuvupolu.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105140958107409.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c09260a7401---rasanapadepomojiruma.pdfIn PDF document text
    • http://rilta.net/userfiles/files/44774693846.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b05bfe9f737---woxofusosi.pdfIn PDF document text
    • https://x-software.cz/data/file/bubozifuzigajoj.pdfIn PDF document text
    • https://manenshop.com/upload/files/sigukibavobogotuxu.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b2f32b452---fudupetixafijajajadivug.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/50595879074.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b6f9eda99f17c524e75565ad98877c75/zelenipa.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a57688ab24d---ketogawevulakel.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/35358067728.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DD 5396 bytes
SHA-256: 75109003e3e9389db0b89ac249ad43effcb5ec0234c6af0266effafc149ac213

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