Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87d686c0779f3fc…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 17:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e796fd0d72a39468ba2e248c29b33530 SHA-1: d492509ec4dea508d37116615ff0dcbb57b92ae2 SHA-256: d87d686c0779f3fc2544a5ba5041686e55f34aa4aed404b493f223bc3d501bd4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://essentielles-theater.de/UserFiles/File/24770217567.pdf In PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/160838ca35e24482569b016c749095b5/98178293577.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/dawuxelumirututinedeki.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/u2slmqaavmnq4h88k39dt0ct7b/gajalanileketibo.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/segep.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210606110349504.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/neneguwi.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/97189900651.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/21948393661.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160752702b6080---13076021634.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///56907524508.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/lasumudufaw.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/0899df0a586f21dbdd50daec1672b2e6/wipowuja.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/35173182634.pdfIn PDF document text
    • https://ayurmitra.com/files/file/16802312017.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a2c823c326b168dc2c32b6e20b4c6e63/zavinulabogib.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/jepejuvuwetinumavuvumenez.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/8847609501.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/80146084274.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/16234110011.pdfIn PDF document text
    • http://gyobel.it/public/file/28531969262.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/36002182646.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/zinavibunarowukofuwoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=logitech+craft+wireless+keyboard+manualPDF 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_off0000dc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC16 19380 bytes
SHA-256: b03cea9d7026bf502c7cfac08f8564c7651c37fd2a5cec10acb0faf402b3491d
font_01_sfnt_off00010e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001265d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265D 11412 bytes
SHA-256: ddfcb63783ddd5120b0f8bbc8e431b1eba61d401a615ee9340bd6ae697cdc658

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