Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f4f9a6b0d6b725…

MALICIOUS

PDF

87.2 KB Created: 2021-06-25 22:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 5708cc1953b47f3fe88a8853e8af018c SHA-1: 163e10ab60acff985f0dec190f6dc83390d14113 SHA-256: 83f4f9a6b0d6b72565db89090af0f6e9763478627c03599088d7238cfe060089
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to direct users to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://irlanc.ru/uplcv?utm_term=literature+review+of+training+and+development+pdf PDF link annotation
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/149a3195e584e8aa8451a1597382bb98/nubosoniriredufuwurarene.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/45794362046.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/jo8h0shmd7li9f1u6nnkohvopq/guropelomefino.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/eaf18466906a7bc66a998c4dc03b60c2/20820842774.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1df2c49a0---jubifibazimolumaj.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/2csab8r73o0or91cjhgr676gb7/80777586420.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/42892571205.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/u3pq175pv2puer2rbds4vqscn1/50693379287.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/3914f62685cec496047061587372b7f3/35124996116.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/tubenipolu.pdfIn PDF document text
    • http://sparkpro.lv/content/file/rekejemiwitup.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/darego.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5452ad5796---84695906344.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/754bd300e0d32698a07b9091762d7276/37697419128.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c98c37de084---bukivanij.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afbb10c662---jilexusofaxisapusodokibo.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/dotulosinimi.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c34fb476a97---37251012773.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a98162626cb---gixuwowolalegimovidosuk.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/54415168516.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/0fd2f06bb36277f52026e435f638deb1/67318993634.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b938ede2bfe---14169069142.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160717fdf6355b---nusala.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/85pcirsjr21t71rqv7rvm4h2eu/sefurokisugu.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f74a0653a2---fezosenabu.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_off0000f0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BD 17996 bytes
SHA-256: 028ba0404ab322483228cba40e3630fa3164687634a0eb457f5e573722e02613
font_01_sfnt_off00011ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDC 10880 bytes
SHA-256: 3b74b3060244b9eea61bf6d1e82392a44d201e162561e8ca0968dda6205e1118
font_02_sfnt_off000136d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1