Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd75a63b0f30b9b…

MALICIOUS

PDF

86.0 KB Created: 2021-09-23 01:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c873ffabe9e328d00ef7af0436fbbc7 SHA-1: 717e24a42320dad1416af3a1ad5e83f9a3215934 SHA-256: 1cd75a63b0f30b9bea012323e8a08764bd9ba29b04cd6a6bdce2c5a9769cd1bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. While no scripts were explicitly extracted, the heuristic firings strongly suggest the document's purpose is to lead users to malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://forexinc.ca/upload/editor/file/63144603618.pdf In PDF document text
    • https://monographie.com/ckfinder/userfiles/files/2378907632.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a65faf3fe7---duvuxomodesijepigomok.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/kizojax.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/lapinalotamarepus.pdfIn PDF document text
    • http://scsychem.com/upload/files/legufewofasofig.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/54830228203.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/28025566649.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/mipuvosevasujixezo.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/fejitivusawojama.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/3516565696.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614633d682244---32371390968.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/sl6gvdcifdrod0l3ajpts6fk8f/54624865283.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/xavedibujadijupazalorasuz.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613662c6dcc72---60099151972.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/67930017704.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/zemorejiferobiwufa.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133115db769b---water.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/8166375860.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/fujozevuzasirafokefiduk.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/zazitugazinijatezi.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/sozavogogixori.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/47933180945.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/nonolumogiken.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=a+quiet+place+2+watch+online+hdPDF 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_off0000eaca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACA 10776 bytes
SHA-256: fc95cfd09a32e79c9a78cd22c12b9d47177d3db082059d400b763341ab4bb2c4
font_01_sfnt_off00010377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B89 18176 bytes
SHA-256: 2a3b957a4052cc3c80ed17aa29ed9cd9e14fd1e8df35ef5323008781197682c6