Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ea41130cf1a4c7…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 16:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0819bae5baafdefb38cd80ed79ee877e SHA-1: 7f6b6812e7cfaea8dc8f31d460888b6a30ef7736 SHA-256: 17ea41130cf1a4c7d7f1dc6014f6ad2db7eaea446092f1133024a6f7e8bfc359
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=android+listview+in+widget+example PDF link annotation
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/duru9fmuf0820srlvqlv8d6jb3/24477952857.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/zupem.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/38419890186.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137083e3d5b5---27108854034.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/83956927066.pdfIn PDF document text
    • http://datcat.vn/2018/file/21370950401.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/87825899092.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/60733044147.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/85544902917.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/bixagukepi.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9ba02237c---29816466664.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/58633088103.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3ufr3487e7hskkgcbpb8f30844/kevovupuj.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/53259968660.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/92114079583.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/lezisev.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/47089287132.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/44617377061.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb2d98c7ba---71892333410.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/30291958574.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a4066a5ad2fbecf78fd92e72fde6863b/kelotuk.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/2606668589.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/41736287659.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_off0000d59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59E 17764 bytes
SHA-256: 55cff82b5f7d6af8a8f972845bba8c78fad71b251328dde0f57a78984fdc18b3
font_01_sfnt_off000104aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 10968 bytes
SHA-256: c729215181db6591fb22b3cdc334c5a6c7579fd39599cd35a9e2cc281fdb9eda
font_02_sfnt_off00011e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1