Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b49c74e891d1b8…

MALICIOUS

PDF

72.1 KB Created: 2021-10-03 05:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dc4816ecfd61cb891fbe92bbf8fac184 SHA-1: dda9c582b92d5528512b9bad6f48f70b858fa2dd SHA-256: 22b49c74e891d1b8ebc7c44c515001fc1b1283ec1f2ea74dcb52d7c476d78a63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The PDF structure and embedded URIs indicate it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://best-of-geldanlagen.de/userfiles/file/91235510012.pdf In PDF document text
    • https://denizlihorozu.com/resimler/files/pilolujuzesometezawu.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/17138396584.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16146d4d000e91---dogotazoto.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/7179281431.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/20669062171.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/jagovoxowikakolebagirel.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/pezonotesewodikiro.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b567f8d880---26519277645.pdfIn PDF document text
    • https://ms02bet.com/contents/files/94166896527.pdfIn PDF document text
    • https://ghnservizi.com/file/sofif.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/lesevinodiluzoben.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/61816420526.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ekomsm2d5quq8m63g1rsat6o18/pexiwologedadadub.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b35559f5ff4572b8d05ad8431a59ef9a/24743182052.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/xodanuk.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614d1fbd1a36b---walokosu.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/vigewubusanelituwa.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/witoxosupuvome.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/6aab4f355955700f7262edb9e3490c9c/nisovegavumogaxokeludava.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/24236085354.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/pinewilanopigoxina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=common+interview+questions+and+answers+for+credit+officerPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC30 17328 bytes
SHA-256: e069a0d909c0b5951f9125749dda6cd555589ee1acb6dcbbaa796613cc7459c7
font_02_sfnt_off0000f881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF881 11020 bytes
SHA-256: 4e82c0e3f4d67f6bc72545961faf9bb8127f80909cf619fd152527a345cfafb0

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