Malicious PDF — malware analysis report

Static analysis result for SHA-256 38cbb5223b5ab69d…

MALICIOUS

PDF

87.7 KB Created: 2021-09-05 18:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 91b58b97119a6bdf0d77048df3101c1d SHA-1: 7df70d054d239b149138d345473908fec66d8c8c SHA-256: 38cbb5223b5ab69d08393d34b7608905944c5ae6ee8b8867c569b64690dce0bd
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. While no scripts were extracted, the presence of numerous external links and the detection of a phishing trojan suggest the document is designed to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://greenmodels.ru/uploads/files/tivedekul.pdf In PDF document text
    • http://streetnn.ru/data/upload/ck/files/posowezosemefafi.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/7h21aaf832m3sn48chsk7ntnf1/tisiv.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/65269850027.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/33904062569.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160811237bd70d---73085860363.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a1188bcedf8---wufufanazapujujexupi.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/17616272584.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/getetejazaxamovunakixis.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad495fd5249---fagosogajemesen.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/9f74986bba23b04ffa241f606794f982/21076936480.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/98086381330.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161328b9f24302---powogesatotilafevibubolek.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9e13794b84940a995e9f22b569429e8a/74132069335.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba531b45997---dinilus.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/66984625810.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/xajoduxexudin.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f896a1b73d---kiraxuzobep.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/sosisigetuve.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/78e4b882df3fef4b6801d48e47268d4d/17589349289.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210708_9EF4821AA0EFB329.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879c7760a1d---90047318072.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/942522981.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/jbiunpr5j4vsv0ans47175scnt/depojon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=wacken+line+up+2019+pdfPDF 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_off0000f05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10876 10776 bytes
SHA-256: 82527f7a0c3cc6563e6302df5e0c41a33c80aa26f4ccd6f21c20b54df6ee5bfc
font_02_sfnt_off00012170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12170 18584 bytes
SHA-256: 6822266fb44f468a81c39d8bf856435d64d17b54ff562620b9b85e0b7607e1de

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