Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ef1cfe75e01312…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 05:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3a1bdf7eabbdb8d243133c6d0e59ffbc SHA-1: 9ef5ecec6f73498460dccfbe6c821fc84185797b SHA-256: 25ef1cfe75e01312b40f21f6335e90e86225910924b8bbba7e014847f3dbdca5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution lure, likely initiated by a user clicking on a malicious link within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8d64f1879---71078575275.pdf In PDF document text
    • http://cheers-gifts.com/userfiles/kakojonuv.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e33983d712f751ccc6b9ee8ea0b2ae5a/ruvatimaxopa.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/sosizonedoxadoxo.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/0e301ab529bf2991d42764eaa5b3262e/39528299633.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/70720797054.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16113d20db736f---fabarasanarekexefedifojeg.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/50a4e4890fc9d9364f8e9db640ee8c3a/62429977018.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610301b482284---mafobepogapimopuzavox.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608111d56fd79---95612127518.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e62849614---vifafivimukobexifiwuxi.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/e9ad4096a16177c33237d4176035af3d/84751661006.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/22773592759.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/mazofaxiropafaropegeku.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/puxowemelu.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/69921579216.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/2798267800.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/57709991948.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/92161368676.pdfIn PDF document text
    • http://benrassam.com/uploads/files/24275460312.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/lalipodinapividubaf.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/sazufikujizijimu.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/807a2e3243d504fbe45e1a1a1b67af48/998378032.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/kekimekibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=toefl+ibt+preparation+books+free+download+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_off0000d173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD173 10772 bytes
SHA-256: 08106b001ee2d0e75c900098c05f6b6b92401ca63eef359ad820425de49a3487
font_01_sfnt_off0000ea34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10246 21436 bytes
SHA-256: d1e27a4dbe6f36f607ec9726c0293565ff67b34d03f00c8bdb7126323fa0cdba

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