Malicious PDF — malware analysis report

Static analysis result for SHA-256 529f5f4f0d7758c1…

MALICIOUS

PDF

65.1 KB Created: 2021-09-01 09:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9e46282fe6cb02156e071770741e517 SHA-1: 7949f4832cf3d68830129145a626637d6adaedb7 SHA-256: 529f5f4f0d7758c1dfb19895be0ec08c43ca6ababc65ef9e5b7afc65680a3a59
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm with numerous external URIs, many pointing to compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7095

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/25f81be547af732e32d980b4d9ac3c6b/gamalovadu.pdf In PDF document text
    • http://npas.ru/pic/file/75635495998.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/gufoduzinisanogugetofof.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/38628595398.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/59836065726.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/8205669.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/kevodupegu.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/kujoberu.pdfIn PDF document text
    • https://ferropula.hr/files/29435357394.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/a21qs2jqns06k29rjkkcj01mbg/50219928438.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6520d80ea6---49660487905.pdfIn PDF document text
    • http://nfc.soo.jp/file/fufinumo.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/95607193651.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/44040068421.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/38614479249.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/85391010519.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/fdada2090b484dac48b2bf8096a54924/zoridafukaxusojotip.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/c1c2f1b943697eeec4a87568f7bfa2f9/91118982208.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/42067619463.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/12980048266.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/guvedusilawire.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/95501266220.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/3be51bb6662c9d95361fcdbdbd077837/tatelezi.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742bbb54bbd---rifepubikukumokifutegaxa.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/lonuraxazasameroxefamebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=omegle+video+chat+app+apk+free+downloadPDF 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_off0000e55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55D 11168 bytes
SHA-256: 6251f8bbcc8ff1949a13c9d7720fee1f76d33930b7232bf8d7f7b462f860aa2f

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