Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cdefa0cb99ea043…

MALICIOUS

PDF

86.9 KB Created: 2021-09-19 16:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b76cbc26fd5f6e8cde38279a0f41c10 SHA-1: 278a6066241cd53ce7761e01f67d89ad812d5dd6 SHA-256: 0cdefa0cb99ea04375a6903a978ddaa7496af18ecd5de79f4f5ddd4f2792d47d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple external URLs, some hosted on compromised WordPress sites. The embedded URLs suggest the document's purpose is to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://allytemp.ru/uplcv?utm_term=how+to+know+if+android+is+rooted PDF link annotation
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416180797e5---94199301332.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/12093685873.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/27122234979.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/42408922711.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/zivuxotiduf.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/domud.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/91568118264.pdfIn PDF document text
    • https://thietbigas.net/media/files/buxelojewegax.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/b7ff243ae6e24db2819d94abd60da3b7/lagewutirobifevulexuw.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/34979258335.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210919_070641.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/89023638342.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/gofebawib.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/6613023406.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/mukexepesepudine.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/desogamavaj.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432fd75a685---68026014217.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/78542411915.pdfIn PDF document text
    • https://hirurgija.me/files/jivolir.pdfIn PDF document text
    • http://keyday.ru/files/files/vamovufekasokunufeb.pdfIn PDF document text
    • http://trieuduong.com/images/Download/wasivegekukazovi.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/ligitejisetifazibulo.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/52926984290.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/bomuvurebol.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/44366304633.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161416f1e731c9---74396807947.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/bumasiwegim.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_off0000ed3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 10468 bytes
SHA-256: 2c703b5e89b802d1bbaa98d0aed6161482db448594f425ba5f44a19fd61475d0
font_01_sfnt_off0001052c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 18548 bytes
SHA-256: db8a9069492cfb1f3e483eddd2f419eb3a8fc08d3e7dbac527d60623daebf4a1
font_02_sfnt_off00013598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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