Malicious PDF — malware analysis report

Static analysis result for SHA-256 86758477e7585741…

MALICIOUS

PDF

83.1 KB Created: 2021-07-17 10:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: ff090a13e58a02b5ab8b655331ede94c SHA-1: bd49a7e00e2161a0ea1c59631f6fca4f5d6067ca SHA-256: 86758477e75857412100800bf651b35ac3e7d3ee69cf30a00be6d9f37113e253
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. Heuristics reveal it functions as a link farm, directing users to multiple compromised CMS upload locations and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f477182d2dd4ed0be2f2229b6370c60d/rebot.pdf In PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/e4779dfe3e6fe0796d0098de7c5b0822/vupuxawoxipojuzosafu.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160748d342a96d---40353398015.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0214789531---bozavonugoxuxexex.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/0c8970702f062b30c3a8d97aad5a4062/xebejewuzif.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/be95389bf232eb74e5a0bf9cd18c2d53/dinelipemuvurasawekaz.pdfIn PDF document text
    • http://yesilkoyluleriz.biz/resimler/files/ziler.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/suvaka.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d41ee3aec6---bafopenisopamarogejawose.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/7746022095.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/34917544699.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/e9e436d00c68b70843f91da73dbbb01c/melunasumo.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/49daf9f6c36b37a10710b692d65dc4b0/70993065902.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/wonesenazibejam.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609841859d90e---vezovuwalef.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7f961b2bc---nanimobutilana.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/pubusanuxuzidoda.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210620171739.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/99441517700.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e68510db6d---sosujebevejupexove.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/36eb44b3489b792e4b800d275e430f55/63640642173.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/48facisf41l01vedfbcrpha7ks/43877423509.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/13276645796.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/gonubagiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=kp+system+astrology+in+tamil+pdfPDF 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_off0000e190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE190 10948 bytes
SHA-256: cce4cca5f488577d782c97a17c623c31ca152ced8d5c8a3d272edcf843567b99
font_01_sfnt_off0000fab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB9 17144 bytes
SHA-256: 3003811f03420d554f567a43024b90234dfd553f9bf8b2bb6479f389ce4c454d
font_02_sfnt_off0001271d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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