Malicious PDF — malware analysis report

Static analysis result for SHA-256 e378c1ee4be5ca21…

MALICIOUS

PDF

76.2 KB Created: 2021-09-11 16:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb6c63e13a565197ab9f634622dcff5f SHA-1: b2c67e3f3c323358e93f711d813cee2c500b6087 SHA-256: e378c1ee4be5ca2159c9decdf6e9b737998044530a321991e54c9d971cd2d692
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the link farm indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://inwebjor.ru/uplcv?utm_term=pixel+gun+3d+pocket+edition PDF link annotation
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135d5186bf47---tesuko.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/35235427186.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3d2bcecd2---kamesuv.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/5554404810.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/pujosevol.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/sebojesidawixuwab.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/rodonalepadujapawugusap.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/narigaxawole.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/didubuvugebometafa.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b16448934d---wazorosuwomilix.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/90711297692.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/bikubopisar.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8e98a662b---49103761836.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/60898649211.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090417352373499.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/ketidudusularuw.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/tuwenanumasagi.pdfIn PDF document text
    • https://hgb.se/filer/file/fetew.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d99f8aab7---mefodapetajonip.pdfIn PDF document text
    • http://cabini.it/userfiles/files/gewomazag.pdfIn PDF document text
    • http://raczcsalad.hu/files/gudagevedud.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/bijamaxuz.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/jejuvepirabodewimofizemid.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/zajobavatidule.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/kuxatazanobarinerin.pdfIn PDF document text
    • http://clingac.com/d/files/71447994293.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/fazati.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_off0000bed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED6 10724 bytes
SHA-256: cec76122119a4a517bb8997014688a676da9d015f762df3a5fd581f7536e979a
font_01_sfnt_off0000d76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7C 20376 bytes
SHA-256: 44b5d5cfbd25c4618aad7910d9a5c465e453da0cdb795c2a17b4670b5444c188

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