Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da99f4acfa9f2fe…

MALICIOUS

PDF

68.8 KB Created: 2021-10-01 00:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e9ea75f0695a1bd3f4061e8f5223d5da SHA-1: 35e17f3baa9cb9ff0dd901744407814b06fa9a3e SHA-256: 3da99f4acfa9f2fee2deb73675e0a61ed97eed1dc0f4cf7d458c5bbf8c85ff01
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are structured as a link farm. This suggests the document's primary purpose is to redirect users to potentially malicious websites, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kagoshimakojintaxi.com/userfiles/file/sitexebeni.pdf In PDF document text
    • http://azizavacanze.com/userfiles/files/61125855324.pdfIn PDF document text
    • http://ecogestval.es/userfiles/file/zaxafuzevefa.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210911181008-xukugefa.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/takajupipegimekosefifa.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/60063887616.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/16374877966.pdfIn PDF document text
    • http://land89.com/ckupload/files/jumekonozuta.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/30283549709.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/gupukebimoda.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b852d234c8---5138593066.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/basurofigevales.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/lukaderunoxukanugide.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/67865706523.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-5/20210905044502217708.pdfIn PDF document text
    • http://proxima-design.cz/files/file/77898651407.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/11985859991.pdfIn PDF document text
    • http://tcihk.com/userfiles/rozemozolotezil.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/41411540096.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/62162860406.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615238fad0db4---sevowusijutaxa.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb65f45987---1833579008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=rail+apps+for+androidPDF link annotation
    • https://easyown.ddproperty.com/datas/files/73188831595.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/94492842577.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_off0000af6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6A 10304 bytes
SHA-256: f9a389bc43228a59ef09e155aabcd19d79e1343377b3bdd2127d143808411c40
font_01_sfnt_off0000c6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000debf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBF 15528 bytes
SHA-256: 3bcc47683ef99bd3e2bbd6ac483c8bf6b37315c777c5ce3d8f4e12a101306e73

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