Malicious PDF — malware analysis report

Static analysis result for SHA-256 381fff42f9034433…

MALICIOUS

PDF

69.3 KB Created: 2021-09-23 10:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c272ddc44e6073fa3916eac6df758f4e SHA-1: df1af8bb6f6d70b67f6842af9c0b123d48297793 SHA-256: 381fff42f9034433edb7a2fcb126415f98605f875ac0e5a9fcb0bbeb50cb9210
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the PDF and its embedded URLs strongly suggests it's used as a lure, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 https://coretry.ru/uplcv?utm_term=test+intermediate+level+english+pdf PDF link annotation
    • https://wfbulgaria.com/uploads/wysiwyg/files/8422894357.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/batuf.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/69810191544.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/69368821644.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/55915961326.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/gewevekaxixomumabaja.pdfIn PDF document text
    • http://szjg.hu/images/file/kolalugerizas.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/16185540282.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/guxokomimebarazovasuf.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/40697137422.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/82386444811.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613677c72ba59---8787044247.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba09152d72---taruxolagupejita.pdfIn PDF document text
    • http://favorit.pl/userfiles/file/pilamifogebuzejavur.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/45038677498.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/64100272699.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/55d2b736c33ab313e90ddfaa886fd2fc/getufagap.pdfIn PDF document text
    • https://centralcms.coodex.net/galeria/files/mujijovamejorimepuwo.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/petilujela.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/xuxatizitupofadakusewamoj.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/98881168066.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd3d724d0e---65162598102.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://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_off0000b09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AF 15836 bytes
SHA-256: 21751c5a77acce56622d31137994820871f4b0a8daa9abc02bb2887c969c4b1c
font_02_sfnt_off0000f114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 10856 bytes
SHA-256: dfc0ca721ac72b05e3bccd251af4abf5196b26eed4621ee82f9ead8de7c60966

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