Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd59dc9d72b0dc7…

MALICIOUS

PDF

82.5 KB Created: 2021-08-02 08:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df2c1f767a99d914eeade51dbe777812 SHA-1: cb4db38b1708fb86cdb30bd15c901beefddb2041 SHA-256: 4fd59dc9d72b0dc7a9f72b6e9007ca4693f4dfcb64baa83092e1003d0bf0f919
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress instances or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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 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
  • 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://catamma.ru/uplcv?utm_term=what+is+the+biblical+meaning+of+4444 PDF link annotation
    • https://binhvi.com/upload/files/4562919629.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/k3aslo4moddtklmvce2ssmca8u/tedulifefujem.pdfIn PDF document text
    • http://esangsok.com/upfile/files/juwaripujabutogotofi.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/49a582fb4572e1034a97c5c985da0c47/mizadimufakajuseluki.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/450c0ec14ad79a3f69cc164de928fbe5/67597527306.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/28017839771.pdfIn PDF document text
    • https://mszukam.pl/dat//file/panekanogemedofa.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/0isl9qokaa1id0puqkoef7fe8d/35825567971.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/0mle7d5iev7i4ad017414d4ee7/17611692078.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/84387569bfaee1da3cbff5216014e91a/vifox.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/ximemubiwikatojub.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/87023482705.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d71505025ff---75644887685.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16099863e05795---foziwexota.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608307c237364---misatelodobufarotukerefi.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/14195638028.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/9k4keo01cceb7r332m0ga4njt3/23047034401.pdfIn PDF document text
    • http://klinok-saintp.ru/files/xilujefavotedilew.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160defea9612bd---56915144655.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/43452701384.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/52003887980.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/soredemogarezoxare.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/85917898400.pdfIn PDF document text
    • 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_off0000e385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE385 10896 bytes
SHA-256: f4786af5e1674873627378511d068b288dca8371f93930bf6f25c7da285c9962
font_01_sfnt_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 15656 bytes
SHA-256: e858f62d818487795f9e910f877586c9f28dcff50c042d75e6e4db7c1d3220d1
font_02_sfnt_off000124be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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