Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b4d9bc5a43e834…

MALICIOUS

PDF

78.4 KB Created: 2021-09-07 14:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c08236479c42835736c78cea4f4434b6 SHA-1: c371d133cbef7273161ae71543e6d41ef6ae40a6 SHA-256: e2b4d9bc5a43e8348149cb5ac4712d30da4b8712f4b69b148afea27334591306
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URLs suggest a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=dungeons+%26+dragons+5th+edition+pdf PDF link annotation
    • http://ajtoablakcentrum.com/_user/file/gewalukolux.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/jogidexu.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b1930572ae0d5cf0eacc6070bfc8b3c7/kixejilivapikunatop.pdfIn PDF document text
    • http://snft.ro/media/file/nuxapef.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/22437393162.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/dulovelofebepizomuvuw.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/bigukamubukulobi.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749eac696c4---82734675603.pdfIn PDF document text
    • http://com123.vn/uploads/file/zelovevojalefanu.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28961fff7---palipevuwelozorizinu.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/73755663250.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c815362ea3---61031268356.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/nuguwedurosesejanexezat.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/wirezab.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e9e69854a---49860277127.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/14c8546d73715329a3572382abfc8026/93986396277.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/ruwuzivomabajuxobe.pdfIn PDF document text
    • https://chp-travel.ir/data/file/dinariru.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a92ab1e7fc5---duvisatogovudusofopixider.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/81917264455.pdfIn PDF document text
    • http://princeverma.in/uploads/files/43336183293.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/8673840051.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcbe7e2d42---vijopebazifufedoxaweruki.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/76772156275.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_off0000c5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A8 22144 bytes
SHA-256: b41f44b5d6ac04482ca80d768da5165ef75d619bafff0c6377371b5b0893419c
font_01_sfnt_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11675 9880 bytes
SHA-256: 042da0ffb846c096a7f7ae633a2f2109282b6761174448dba2885096c9fa7706

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