Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ab784e0fecf992…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 22:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b27964046dde4dba697d1a26974eb311 SHA-1: 356f5eac1d1fddcaac4ae8bd83370f7ae92019ea SHA-256: 25ab784e0fecf9928a04e400f03966403cd9a1ae39e0d2adaf2b02c50992a7a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress upload directories and disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL analysis suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://lapakunited.com/contents//files/14571391331.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120da7089271.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dc1fb5d82---vimobitamuwupunu.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d0aa1e684c2---giseleja.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082a157cb61b---ripuzuwawamu.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/zabutobefazegara.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/xituserojomol.pdfIn PDF document text
    • https://seikico.net/img-tym/files/bumonodipidowapekosezabud.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7aae1e2989---zinotafujitoboxakezogozan.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/xofipuz.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/putejefefeguwevekupak.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a95ab4b1732---41630903905.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160707c8fca17f---39662608539.pdfIn PDF document text
    • http://skomi.ru/img/files/file/61011322647.pdfIn PDF document text
    • https://congchung7.com/upload/file/82340868145.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/18033196675.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/a0389fbceed83190b3255b6661ca25f0/wexokokebisotedonobidudol.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/ririwijijuzixonix.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/sajesotaxanaxitor.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a58889917d0---niloxozerov.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/53360209025.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/rujopajem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=convert+iphone+photos+to+pdfPDF 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_off0000e31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31C 10484 bytes
SHA-256: 81dc1f56d35da02beac56c65a9279f17cbe5b76713f93935a8b1949056d089b9
font_01_sfnt_off0000fae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE5 18336 bytes
SHA-256: e3c9a1ff3e5c84c231d71632a63c4d3a3af594b565948215f2e839e653b06f4c
font_02_sfnt_off000129cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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