Malicious PDF — malware analysis report

Static analysis result for SHA-256 82baa655ea0ffc92…

MALICIOUS

PDF

74.4 KB Created: 2021-10-02 09:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58b823c6d28027dc963c215399f68440 SHA-1: 7af49d23f48402c018957c2ec95fe696c2faed54 SHA-256: 82baa655ea0ffc923fc3bba453a6ffd9e7e1b528221f9fdee18a3e81ef31b517
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, which is often used to redirect users to malicious sites. Several heuristics indicate the PDF is a link farm, with many URLs pointing to compromised or disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://obedovice.cz/userfiles/file/nasijurolebewarurotuve.pdf
    • https://binarbaid.com/public_html/userfiles/file/vezawawikenitapifaluvupek.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/vokaxag.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/07cc4b3c392cd86541a0021297432265/65563389211.pdf
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/palevetobilexuxuzesevix.pdf
    • http://kahasat.cz/data/file/64809788285.pdf
    • https://anukulagrotech.com/ci/userfiles/files/83415506506.pdf
    • https://rhuyscampingcar.fr/images/files/gatelusilamunu.pdf
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/78483699221.pdf
    • https://magiccat.pro/ckfinder/userfiles/files/33599969789.pdf
    • http://bertoniamministrazione.it/bertoni/public/file/34754800672.pdf
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/bomenusudesakoni.pdf
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/jojomagomanajejajuz.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/bot9egvc45n49ta2blrkkt7ta5/senasezalosewelafewabukur.pdf
    • http://tecresconsolidamentorestauro.it/fck_data/file/9832128409.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613067ea9dabd---93716971468.pdf
    • http://technocom.pl/editor/file/43580339928.pdf
    • http://adm.stikom-db.ac.id/js/uploads/files/31211037019.pdf
    • https://v-rshine.com/upload/images/files/91615377409.pdf
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/rekewuneziferowale.pdf
    • https://slotsonline.ro/app/webroot/files/userfiles/files/44706982143.pdf
    • http://yongqingtech.com/d/files/kesunuzikumiravojazekiv.pdf
    • http://kunas.lt/app/webroot/uploads/files/netijakometibarapolunawur.pdf
    • http://tuvanthanhlapcongty.biz/upload/ck/files/dijidofusebif.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=convert+text+to+cursive+handwriting
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b944.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB944 16792 bytes
font_01_sfnt_off0000d15b.bin
5aad1bda1c97caaf67ae60726d5accdfc722d37e3b843ce1952d5647f7f62e68
pdf-font-stream PDF embedded font (sfnt) at offset 0xD15B 10988 bytes
font_02_sfnt_off0000eabf.bin
f3a34d056e39e3dfd9ac16ff3c36732f2abf2b872910f0c45cdb16fb463c0d07
pdf-font-stream PDF embedded font (sfnt) at offset 0xEABF 18848 bytes