Malicious PDF — malware analysis report

Static analysis result for SHA-256 21bd7146ae2f2d03…

MALICIOUS

PDF

58.1 KB Created: 2021-09-25 02:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a20bab18d6d32035f9f9c01f7351a6f0 SHA-1: a9f0fd923e4b710002ec0ca48643806adaf0d2a3 SHA-256: 21bd7146ae2f2d033a6153ddc6076e0909ff58bf42e850568af2cffe8934c3fb
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and ML classifiers, and exhibits characteristics of a link farm designed to host malicious PDFs. Several heuristics indicate PDF links pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The embedded URLs are likely part of a campaign to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7061

Heuristics 6

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/3b80f27e40a5c8611c81d32a12cecf3d/59462056974.pdf In PDF document text
    • http://ttc-investco.com/img/files/tovivadakizebeduga.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/munebizetefaxorewunogaf.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/27350204835.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/gipisekevezafet.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/40162207803.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa81d00a8---87272625448.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/hvrnfppdqgl1f20rgfl0g8h9ie/miporikal.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4f48278c3---jumurixigel.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/ximazuwedefetexavaz.pdfIn PDF document text
    • https://el-tall.pl/pics/file/23019043426.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/jusuliduruwuxun.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/20cp8fml9ba8gq2rttj1r4mdp6/bifedajomixenamejas.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302eff9d30d---63978963552.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/jusuzonejaganamodudamufoz.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/249d4e8901b97186f3e84f5c98674830/jutikivawerimifutemazewu.pdfIn PDF document text
    • http://ibb-online.ru/f/file/vawovovuxuselij.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/bobosilenekexoxitavexenak.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/gulalalifotugamelifa.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///bejixuba.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/doladujupafibadeleperow.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/95069790411.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/xebozosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=photo+video+locker+appPDF link annotation
    • 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_off0000b873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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