Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7bfc7b6c763681…

MALICIOUS

PDF

65.0 KB Created: 2021-09-17 14:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 69ed113b4d5640b2c72cf9365727bb1f SHA-1: 16a7eb2ff4a4da7d5cc279ff851365990829c4b2 SHA-256: de7bfc7b6c7636811c2ef7d16d9c375d8922f610a2db73fb1b1a3f9ab8eb83b7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous external URIs and the 'link farm' heuristic strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7014

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://laborke.ru/uplcv?utm_term=sp+flash+tool+tutorial PDF link annotation
    • https://matratva.in/userfiles/file/97446608198.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/wuxaj.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/rijewuvizizusi.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/vobezugamat.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/40057226621.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/nezebuzusifekosofejowudat.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/fufukobonoxufusanep.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/461497759.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/tizozuwikafevebogavori.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141e0490ee70---32831799682.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/56145547735.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/lumisa.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/42201960689.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/7ff1e14d4f19e50eb3156887ba4d1b51/xuwogarukesutifotu.pdfIn PDF document text
    • http://matras-devison.com/upload/file/monipemirezeselotinazus.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/f1019d14bf17ee145672d2289b2de146/28553360140.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/74321215023.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/ruwoboweturubegaguvuresup.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/18057930337.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/nefileput.pdfIn PDF document text
    • http://oris-am.com/editor_up/63660428386.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/4176532121.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe4ae09116---13568167335.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB20 17828 bytes
SHA-256: 2c1a556dc6f323ddc8c83e274fdb9ccddbbbaf2fdf4eee3e1010b8d33d618c2d

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