Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71a4c1e0a4d424b…

MALICIOUS

PDF

73.1 KB Created: 2021-09-18 03:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4e7c0fc5d77c3a7afc874da130518b22 SHA-1: 05c060127f2d9e98a4af1b411251d2240bf34dc4 SHA-256: e71a4c1e0a4d424bb8b17c60e1bb41fc8ad0612cc5f50f1768bb4da0c3d991d5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=list+of+collective+nouns+for+class+3 PDF link annotation
    • https://simpangkanan.com/contents/files/radiruk.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/41638455443.pdfIn PDF document text
    • http://rurisnet.org/images/file/65666897879.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210914_161043.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/16787220780.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/8231996075.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/gupudufudinotirew.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/gefenuvofimekikes.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/janojomexaxadulena.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/71385580046.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614151424a9ad---bodijub.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/pifudasaz.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/8411055105.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/60535056827.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/bulisetubodij.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/163071913755209409424.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfac499c88---bonanenodi.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210906202352.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/65364390158.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wopelevopiwovazizusuj.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/xupukifovudivipiva.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/90085174419.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/98709978115.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/togesagitokufenidenenuwup.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/98264979641.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_off0000ba91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A8 10624 bytes
SHA-256: c18bef1df11709aa0eb3411db8e41d80ea18a9964996a5ec344fe465575a29e0
font_02_sfnt_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 16996 bytes
SHA-256: c73811e37738a76b25d6480f6e38e9c4f8b4ea14bfca4f2a8e8aa16d997de4ff