Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e4f60cd661965be…

MALICIOUS

PDF

73.4 KB Created: 2021-09-06 20:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 75003098dec8c6f2bee42da38f3f25f5 SHA-1: 1e01b33cc1ca813a2e0afd3e11b6f4fcf6c2eccc SHA-256: 2e4f60cd661965bebf880783ec10f8b017d58181695efc969535d7b8b5dd9a65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, several of which appear to be compromised WordPress sites hosting further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the nature of the link farm suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://red-adlay.com/upload/files/nanusovavosanaw.pdf In PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/45835979935.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/nametokijigikirif.pdfIn PDF document text
    • https://adikketiga.com/contents//files/18977953990.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/wudekotuved.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/49118590162.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/zeluluzo.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/82525420683.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e138e6f1756cc2ac4ef745e99e00524c/mebuxewanuwajanepezedo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a826d23c447---doladikubovogomotuxekis.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/mulebixafafajiwejodiwil.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f2a98dacd34---xiketedaw.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7b4a8a6cf---56317753881.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc24c7d1661---libur.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/jakulopediwekogivite.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608361dac59f5---92998815118.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/webisisifa.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/buxuxurivajezovalutez.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/e6a628f6d84d41be309075a81e4bf9cf/fekibebi.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/61884855705.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/71524124291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=variables+on+both+sides+practice+worksheetPDF 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_off0000bce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE7 10896 bytes
SHA-256: 8c09edb958873f234fdf15df49f0fcad23a560210df4e66a520908b813dfae97
font_01_sfnt_off0000d5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DD 16388 bytes
SHA-256: 3be9a24331470956a26e5b3ff62a49c989c563d89f6a39c02c642470cd2cbd40
font_02_sfnt_off0000ffb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1