Malicious PDF — malware analysis report

Static analysis result for SHA-256 8370b2b3e87381d6…

MALICIOUS

PDF

100.1 KB Created: 2021-08-06 13:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f209fd913c0b11df57c3ade0680c3441 SHA-1: 2130df1b2b20667ccdc07e765633b68a56d1c73c SHA-256: 8370b2b3e87381d6a52ac45514e8dc17cf82e61f028016ea8274df1b5adc67a6
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external URIs strongly suggest it's used as a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079713fcfdf6---suduzugiwowataf.pdf In PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/16774385546.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607258cfa656e---13813191530.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160822d3724b5b---fuxibogoxazozapuf.pdfIn PDF document text
    • http://plncse.hu/php_data/file/bibevamesiratawixi.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/b06n5mcftm27k0qumjdr3ven5e/vonojigafepevo.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810e0be47cb---jemifulesinisusizinugufuv.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/migofoxitibarorutu.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/tmkokipp31f8oku3bhlq6m7c9i/gajusagene.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/kuwobased.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961ccd15048---62464386600.pdfIn PDF document text
    • http://allseasonsbanquet.com/clients/868236/File/18142000334.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/zigux.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104c856b7dbc---8915652153.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/26883684484.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071fbe0bfae6---nexuladalonada.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/4l02tjjmv893jjjeefgl3iinf5/jasaxud.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/55268069174.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/pafuziv.pdfIn PDF document text
    • http://uniquestatues.com/clients/9/91/91c6e204ee4529d3b478b0717040545d/File/lazatigesaxogopoxazo.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/26780548707.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/36989702474.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/53587200661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+find+hidden+gps+tracking+devicePDF 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_off00011ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE8 18796 bytes
SHA-256: 198caf011d20802e185a4a57941ea7ba9366f75cfa0d86b6781f1ab8245f2685
font_01_sfnt_off00014ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16709 11088 bytes
SHA-256: a35ca0d8ae28fe001640b584a5470fa62bf36efe9f44442e93181eb3d94a4b23