Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6933c6fb606913…

MALICIOUS

PDF

95.7 KB Created: 2021-09-22 13:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4731010de8732244baece81f6bae4491 SHA-1: 472f2061bda5b53f35766140a780129dcaf80b10 SHA-256: 4e6933c6fb606913b99693bb5382e1ed0a41b9ca843a639965d7cc2e1e72b10b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URLs, many hosted on compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malicious payloads or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8586

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.
  • 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
  • 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=system+update+for+android+phone PDF link annotation
    • https://kemxoi.vn/app/webroot/files/images/pages/files/32926722414.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16136315069e35---mibazojenodelipidoxa.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/79ebde9eb18761f2267fe8a61ef91de2/78313085778.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210901_074554.pdfIn PDF document text
    • https://primer-spb.ru/files/files/suparekaminafaxet.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/42144461046.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/keben.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/mowufugadiwesupelok.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366ab756383---towatixojimedogorelano.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/99538293946.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/77354251043.pdfIn PDF document text
    • http://elsped.hu/files/file/nobibiwarirenimibagogipug.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/32982950577.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/pedilaboxamu.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/tojenakegegowanupobimiz.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/jubesaf.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/xuwukezaximalaxanut.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/77587847468.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/pawiragatitimolevixofap.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210920_060932.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/14939282247.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/13757527152.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/10788151696.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/63686098229.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13833 19052 bytes
SHA-256: c26ea89e1e82ecf223c8e36ed172d542d1749d0723a3e13263410775b2e92634
font_01_sfnt_off00016a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A70 11008 bytes
SHA-256: c0ce39e69a1d7beb8fdee18316fb17c718c3ff1b14b6e144a0264a06c7d485d6

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