Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa859ff4753f53d1…

MALICIOUS

PDF

80.3 KB Created: 2021-08-10 02:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-06
MD5: ce5cd2ce79bab98d6880518f251d34f3 SHA-1: f6dc1b09ee17dc6aa3c9775d0c7a56ea2d7c5dc3 SHA-256: aa859ff4753f53d12f948265862db3e408038926339d8b2d15ec3311850d2574
156 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medtek.vn/storage/file/xawuj.pdf In PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/83bf21c15b953e2f3e8adeb2eabc6bbc/63016888958.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a01a42c9666---wenixemizudosefaxagasuke.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/darudugijavudebumetej.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/10201296b1d602f09bd1ba8b41f43f7e/82570226049.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/77261525279.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16077f610905ac---31110936247.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/htbij3ffq6bf6q7dlk3ku8qrm9/75113560980.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/rusebunedetujepafuxu.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/f196736382d90aa0c4828591fd555387/35096653476.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/kadibar.pdfIn PDF document text
    • https://schmitz.cz/res/file/nomogal.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/nogegapeleletofu.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4376db363e---42719479473.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/livolo.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20216251719531011.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16099c5b48e81f---ruxifeguzedenevikizojawap.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bc2dd23e9---savitufipu.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/wanogosagozafera.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8a67f1b9d4---4253903695.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/jigidirepot.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/h5fb53svkvo1b4j1kssqf3ttdq/55805549299.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7caa076eb---83949679038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=lee+enfield+identification+serial+numberPDF 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_off0000d85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85A 10836 bytes
SHA-256: 5223857deb2777506640a9f2536bf29c00ca349cef6dc3c968d4ef3c687d6948
font_01_sfnt_off0000f153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 16440 bytes
SHA-256: 23f76ae8bc9a3f2af902ca00e8949fe4ba310f9e35efaa5c6ec0614b2afccda4
font_02_sfnt_off00011bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1