Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad35c2e63c97f8f…

MALICIOUS

PDF

88.9 KB Created: 2021-06-29 18:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 928b310ed7692d9cdc78a07c35709a6d SHA-1: 6f4fc15a2086b1358188b32ebeee71e73cfa4af9 SHA-256: 7ad35c2e63c97f8fcd2f43f3cb6cbfc085e4b16b5fc7c126b17fc0085872f901
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The document body is unreadable, but the heuristics indicate a pattern of hosting numerous PDF files, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://agnieszkapawlik.com/userfiles/file/robevovuvimibedovifara.pdf In PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1cb132c59---soxikumarukiwunimusinugi.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e6b0eb441---sipabadilexorupajikuras.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/fe8d2a123bf6ffed791e651026853cb1/44548023788.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072e47478b64---85939925521.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/walelenafuloferemeda.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/8e059564d0856f1c04bdf8b5e79854dd/84021088708.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609406c410c9b---20508503059.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608849ecdddb6---woxikugo.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc13b5d1a66---59501708518.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/safaposofez.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a735561cdc---gadagitarokaj.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c2dc5968a258e652dfe6d8c825b2b62c/78398131068.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5a4a1d4f2---33261225745.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/45ff5dd4bc8296c1a31fc13553f02204/34093285167.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/2dd7910300d4d18676e9b1edf1d75cf5/1049270704.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f4ee0d449---96241086604.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4c2d81c2a4561d623cf4c840851eaa82/44154062892.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/84905763099.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b854c6aceb---41053517874.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc8479805e---33946042760.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/73851211438.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/fad280ba9ccb1e363449e22a62616845/29293477420.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/venaras.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=analytics+excel+templatePDF 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_off0000f96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96F 17212 bytes
SHA-256: ceea9e181ce1e5752ca77285eaddaa2bd42a325d7e26e2ad927106eb744357bf
font_01_sfnt_off00012679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12679 10512 bytes
SHA-256: 75ea706ead881b22cc16817abb919d3b818992d12f1f6f9ced24d74e936bc5de
font_02_sfnt_off00013e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1