Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df1a547af37878a…

MALICIOUS

PDF

74.9 KB Created: 2021-10-09 12:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 87d06c59417abe7b14a47dbf9f488855 SHA-1: 200f42a0b339e7dd7f00ce3ac1ac09bf2ef3580b SHA-256: 7df1a547af37878a9e31ec0979180d35744e7119c63611ef663bc228437e1d5c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of multiple suspicious URLs suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://allytemp.ru/uplcv?utm_term=the+reactants+that+will+form+an+ester+in+the+presence+of+an+acid+catalyst+are PDF link annotation
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/21518976624.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/kudolipukexud.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/vopatiteguzulubedirufijeg.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/kovalojevelikekuwotiwe.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/48779975773.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/rusasozuner.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/fetota.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/pepulobajiwemapagabalim.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/tikufikimabivanirob.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/48342724693.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613754772637a---29562915268.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///pitolaturujupetesipojolas.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/8893003.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/84539630742.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/1363753838.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150338fcf52c---wuvabazeferijewogaxifir.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/82176127872.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/limexekasetot.pdfIn PDF document text
    • http://hidropro.hu/upload/jofobara.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/72109919130.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/e005ab6150016af42af63051bbb68289/lafelawupira.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/acf16d1228b04a2cb61bde15b76648a3/15137867411.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/wironajujemobi.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/sipej.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/kevipumigovu.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_off0000be0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD621 17844 bytes
SHA-256: 7e8f89eede2fed16eef66b6abcbbe0598ea87137e8d32de21e975bb52d4765a1
font_02_sfnt_off0001038a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038A 11048 bytes
SHA-256: 8bcb9365844c5418b7fef96622b5ea65cc8d22244f8ff30758d9d2b289768012