Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9719edcbe2661b4…

MALICIOUS

PDF

72.1 KB Created: 2021-07-19 22:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e93365f7d8f83711c884a2abe2e3ccd6 SHA-1: be8150702e9ea0d8176b973e78e314bb87936ff0 SHA-256: a9719edcbe2661b4541bb3422444ae5af9b89e396e357620fc19bc30562ee86d
154 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure and URL targets are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6585

Heuristics 5

  • 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
  • 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://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f655dfe7---5511217300.pdf In PDF document text
    • http://beloezoloto.ru/userfiles/file/fipabuxuvofefovovatitolo.pdfIn PDF document text
    • http://fkhd.cz/data/img/64650299065.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/tavorirekerigud.pdfIn PDF document text
    • http://samtekelektrik.com/files/13555049235.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/k144524uvavmf1vsct1dqorh6b/78663795450.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/mohr0j9i5r3eg08m0m38mcn6fh/60588057571.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/28842432758.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/18068955170.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/26d3d6877bcd41a7ba909d0edcf855dc/14411940125.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/rigeterexavakofudonarej.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7575a13f51---1192806819.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/17251928195.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/e2164f73e276d892a13fd90bba86aca7/lebolawejox.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95bb8d3d0a---32941250685.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/wibota.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1626231202.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/6406c74f9d129e19a7f7a8bdb1996e67/7356073970.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/bd2f2539b6c1d49b13e3c362bc42a498/4547903541.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/27165217284.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/67154f01177970565a10d9e03735b003/xusefe.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e5fb2ab9c---60804078640.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/farugizogukad.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/70236518683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=praising+words+starting+with+sPDF link annotation
    • 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_off0000c8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AC 10436 bytes
SHA-256: 63d7a98770b9e781a2bbee4656e1f66a577189bdeafc9ae72f1b8fa9d71aa14e
font_01_sfnt_off0000e013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE013 16556 bytes
SHA-256: 4dbc605dfff0264b157bc4e88c1425b7b2b5184bc1870736d33806207f19d252
font_02_sfnt_off00010ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1