Malicious PDF — malware analysis report

Static analysis result for SHA-256 e050ea2513a27e0d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 06:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d00238f3725baf5816688483cb992b6d SHA-1: 7692532122189b57816dbd90e6183a83a3a92cd5 SHA-256: e050ea2513a27e0df78f9187ccc002e69e7ffd0069721bd45a18c6001cc324cc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or utilize SEO poisoning tactics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/97536000557.pdf In PDF document text
    • https://martensmgt.com/business_school/uploads/file/28677389057.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/tinarazusa.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/kijepusejupumikanid.pdfIn PDF document text
    • https://majubesar.com/contents/files/60876675608.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b515380529878fca4a48891930a58bfa/zegiwevaxe.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/30405087457.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/nedasezixexinatozoki.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b52bf9101c---xonofidixezojoxakiw.pdfIn PDF document text
    • https://digicpictures.com/downloads/90040513095.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/maliwawojudarigu.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/nonitojatat.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/redaveluvejutobikivuza.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/wutodilikuvojekami.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/52952147370.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/230ff9a3ae34f8af1ba47bdda1e540de/5441212512.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/jogigetadenati.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/43862009980.pdfIn PDF document text
    • https://samowar.ch/upload/file/torexofomaxitubuzureke.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/buberomalasafukuxugowos.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/gexen.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/67837569590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=fnaf+2+full+game+downloadPDF 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_off0000daf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF3 10520 bytes
SHA-256: 3ea0b899914c609b7303b8cf4c908d1cbb3926e51a5b9c64bd6f660bdf996b21
font_01_sfnt_off0000f2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C5 17552 bytes
SHA-256: a93cbb4c13a6a07af12c3409d91db65b12d32ac9bd9f1031e3dfab636be98225
font_02_sfnt_off00011ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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