Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bdeec4ccc1cc2dc…

MALICIOUS

PDF

87.6 KB Created: 2021-07-05 00:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: c6865ec19372b447a0253bbb47f89282 SHA-1: 9a0fe54ed31774fdc17baa10efabfdc3fdb28900 SHA-256: 7bdeec4ccc1cc2dc98f9102c83c9ffa6347047bf308fc7a3d6e52c17c8fb065c
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 0.9947

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 https://drafthe.ru/uplcv?utm_term=different+types+of+french+fries PDF link annotation
    • http://altelaw.com/uploads/image/file/86224841386.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/08d0ea61622b699c98ce2ad63abfa756/39365001489.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b130528ce8d---95077487430.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/43548949427.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/81344419152.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/pejanugajen.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8f91bd398---72350063145.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b741ade1ed1---50736201275.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/rekojerupobojugisodaro.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/asq1lltlhat3emcuddlv0s7os2/manojateruluwivejujalotib.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/44779279234.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/pemavo.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/nodesazebike.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/ramofogaxitipamapifitew.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/45615963925.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160853f3726ef8---9118571699.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/54976424170.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/22866445021.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/99309312358.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/88244353736.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///25604581654.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/27927826536.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210515190634_1739797416.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac46aab6400---xinobezejediti.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_off0000f1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BA 17728 bytes
SHA-256: e10e84fde27cf829a0a75c842110809fe477cc16520346a2960a9500b28cea47
font_02_sfnt_off000137cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CC 10484 bytes
SHA-256: 774e89d52a40ee6adabae826fe55fc690fe711dbc586d7c08f089978ad6c281f