Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e4281f48d8fcae8…

MALICIOUS

PDF

79.7 KB Created: 2021-09-21 06:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6f6449e27ff0541bd85ff6b434efbf67 SHA-1: 08122eea35e5c5d66a22f65c8cdc5c3e1c2d293f SHA-256: 1e4281f48d8fcae8f03bde20454a57d7f12fe3b3c194e2f5727958bd37023ce0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to redirect users to malicious sites. Heuristics indicate the PDF acts as a link farm, pointing to numerous URLs hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://enslev-anlaegsservice.dk/userfiles/file/telinawegebavuzufupexeki.pdf In PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348c847b6b0---runifokuvavojew.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/gojuv.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/7464425250.pdfIn PDF document text
    • http://fpole.ru/sadm_files/luraka.pdfIn PDF document text
    • https://domilot.com/uploader/files/6933398980.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/wokogaz.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wokiwegawaburefofatenuwu.pdfIn PDF document text
    • https://506hlapeta.com/files/file/48158138610.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613361f7ba23d---sogifem.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/nateselezavi.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/86991713166.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/15031292939.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/14208947047.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/90366135474.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/zilexa.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f59df1a438a52fca0ff25ecae31341c4/fedijekijo.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/wajus.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/jogexonanawusiluw.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/bidakinexupufuvazaz.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/60142235764.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/14245210569.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/lejonadapazukuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=60+degrees+in+radians+in+terms+of+piPDF link annotation
    • 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_off0000cfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA7 10988 bytes
SHA-256: 5bb651b88c87b5f69f4f423ba55a042f2114940a1d50b861104bc0c5a47c87bb
font_01_sfnt_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 18472 bytes
SHA-256: 2302fc2da8385848811a3bbd6e0f53ecb4efa3ce436f556c9c3fe8d4b23d13b8
font_02_sfnt_off0001194f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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