Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8fb4f87453bbb07…

MALICIOUS

PDF

53.0 KB Created: 2021-06-20 09:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a6e3bd40432f477c37c7c5bca5de0155 SHA-1: 787dcb12790a3ab087e27ff2b2e94c5a4e352610 SHA-256: b8fb4f87453bbb073d52ac0e300444f53505c10a0f92ea5a6322b2ef92c0b59d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely lead to further malicious content or phishing attempts, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9483

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 https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/7c475310262fc5c39c645fdd4ee737c4/kikoverugokimorazolokine.pdf In PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/8cda099043dd1ab4868a3f5192db856f/66898334193.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0604067dd---digevigugul.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/18518095763.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/90958847227.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/zizeseretok.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/74q9d9r9emunh4fv1i0p5ana01/lejopupukefokigenaguvu.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/918071412.pdfIn PDF document text
    • https://abeess.com/userfiles/file/tojajovone.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5433203c6e---vivode.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ed6oouucdhd32dh2hsbpijfl47/rolimixazobidevakupigapud.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/wukawinofibivukefedevas.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f222789c04a822976ce91b1b5f87e72b/pevoli.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/id3fpruft56tl2brn3mvplqni6/gavosixogaxanowekem.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/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=principles+of+agronomy+by+sr+reddy+pdfPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB8 5720 bytes
SHA-256: 110d7a7b48c34948ed0ec05b2c0bb1239a690b2da7dc0a339bf1a9092b8737b1

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