Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee0fb86033eb5e7…

MALICIOUS

PDF

84.5 KB Created: 2021-09-23 17:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 40632002c918421bb4dfe1161d55482b SHA-1: 53f1f7d53ab6ead23a01dc51ff8d0d456ce34137 SHA-256: 9ee0fb86033eb5e7fbeb0269a3d54ebaf7725969ba473f00fa8fa071e3a4ed99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms designed to obscure the final malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to evade detection and analysis. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=play+store+for+pc+apk PDF link annotation
    • http://seosanhrd.com/userfiles/file/20915201914.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/40649428016.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/91035356248.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614118ed527e7---faxajiginapalemugegobok.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/87750217382.pdfIn PDF document text
    • http://vinmexindia.com/uploads/kufebaloxonun.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/81439277438.pdfIn PDF document text
    • http://ativn.com/upload/file/xugewozimagoraxekifo.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/kefutegovo.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/gotitiropubixig.pdfIn PDF document text
    • https://eetravel.net/file/25416155896.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/votosapodejepuvilusi.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/jijezifib.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161430568c09d9---52164252845.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16136a937e5f9b---37028104176.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/viwajup.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/wubapewofisejozo.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/xelutixamupoxof.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/8020846282.pdfIn PDF document text
    • http://protezas.lt/i/File/53169437627.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/nujofugapunujobo.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/55449831544.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/87641485774.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16149149a1eef8---3693388667.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/17971596456.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_off0000e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 17524 bytes
SHA-256: 21a7c768dc56164a917810d41607c8e8d36461faba9c7a22aade6742a57afb8b
font_01_sfnt_off0001140e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C25 10484 bytes
SHA-256: 89cd922c619a267777681f7d01b6157e6af74c82ef142ad41cd7a0fc9e6e3c57