Malicious PDF — malware analysis report

Static analysis result for SHA-256 78dacd451ac86a68…

MALICIOUS

PDF

74.3 KB Created: 2021-07-19 16:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 7ae8a303f05bf7e317655cb06efcb298 SHA-1: d57a5878c5cc88edb4003c4d7340be731f6f58e5 SHA-256: 78dacd451ac86a6862333e36faaaf08f571359e4ba366eef866e5b6845c61b81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to distribute phishing content or second-stage malware. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43ffda5ae6---34380881950.pdf In PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/37994154178.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a75a430b322---jegewezakusubemekalikaxo.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/o6dgu8caole7arpai7p4m0hpe3/fixofosav.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16072c75ae5861---womegodajexefu.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/sarexoguxavomogosukifo.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/ric74nkde6b0n21r1i2212lhu0/ruderika.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a1356c055---52560154589.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f02645e18a---renekutetavobarusofun.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c15d5128271---90223766971.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2f1e021b---xatewixi.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/8091125c67285e3251d2c2faadf1622b/boruz.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/savovilefas.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/45936750410.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/pumokexeruxini.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/06a346efc98b2882ee256cf0940e2f28/nedebiri.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/19872855676.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6172b1fe55510251364c32f762a436cd/fidezan.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/buzuzururuneteseduti.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/56164441599.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/bigakinisotigogututizetiv.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/xupupilulosirisopedel.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/junepotapoxilagotas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=word+problems+for+subtraction+3rd+gradePDF 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_off0000bf95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF95 11368 bytes
SHA-256: 5419dbdf824f6ca9828305548db8821d3ca159422dda62d64c107c16fd23e428
font_01_sfnt_off0000d9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F1 16232 bytes
SHA-256: 84423ad09f57d73166357cf59a5273d43219fc4e5e0d919fca69f93f08f09459
font_02_sfnt_off00010392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1