Malicious PDF — malware analysis report

Static analysis result for SHA-256 8438d959a4e5eddd…

MALICIOUS

PDF

85.7 KB Created: 2021-06-30 04:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 801211a410458801e0a671d3ab06122d SHA-1: 73e8bdb28cee8101b3896e6c484dc3a4d3c10bed SHA-256: 8438d959a4e5eddd1d0ba5df25b065cb942a330c4428a96d9c18e7bd579a70f7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure as a link farm is a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://queure.ru/uplcv?utm_term=ocean+coral+and+turquesa+cancun PDF link annotation
    • https://szekszardportal.hu/userfiles/file/7343831209.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/11153960024.pdfIn PDF document text
    • https://chptravel.ir/data/file/76624308700.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ndmi780a34lu61gpskro55lfmp/70842770391.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/40023da4f5c14500e14d11d0dfd5c2c2/zuvenukipavavere.pdfIn PDF document text
    • http://dges.in/userfiles/file/90879106717.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/2aj88uj8h5qb05n50gurjeei50/jomesad.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01e71d8be3---34449397301.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/tatedap.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/bawegebazoxujojaveb.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/87866771725.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210619_C65D660EBD17B288.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/sifimawenabad.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/98937238799.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/020f42b450e95a18483d7256891480ba/danijazafitimigamikorujux.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/kanowebaverogududo.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d7201e5fd---tijumilipokemaxubiv.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/u0ii4t2r92ohsrlj6urof774e5/56462855729.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/n0ucrmljso8tr96b5fbn92d712/56682445586.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8e949be76---94875530509.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/68220882210.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/95836403651.pdfIn PDF document text
    • http://aimic.com/userfiles/file/77935907167.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/i58goacaddg4olefnb4523fojr/72345651617.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_off0000e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 17808 bytes
SHA-256: e21fe6870b761e770b0f90a5b6ce607b38f3364e51968e991846efb9f8059a2e
font_02_sfnt_off00012fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFF 10540 bytes
SHA-256: 812a2e68b502d99154c21af5d4a348c25d7ee6daa9eaf3427424a22235237d98

Open this report in the interactive analyzer, or submit your own file for analysis.