Malicious PDF — malware analysis report

Static analysis result for SHA-256 4865ad020ee6e911…

MALICIOUS

PDF

82.2 KB Created: 2021-07-05 01:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 950d43066a59487ded3e84a9b9fa0719 SHA-1: 18bb041907b23a970986c12a1b82901eb601b95c SHA-256: 4865ad020ee6e911fb6aef2bdbd9cf73097cbcaf53de99ecf8d6f3b7266b6da0
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links pointing to compromised WordPress sites and other disposable hosting, likely intended to host and distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, with the links serving as the primary mechanism for delivering a secondary payload. The presence of embedded URLs and the heuristic firings related to link farms and compromised CMS uploads support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://laborke.ru/uplcv?utm_term=victorious+beck+and+cat PDF link annotation
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e015a71d7---67791558184.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/kusagudegezatobesoxubiw.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/pilupalobosazaraxomis.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e5057bd62---duvituwolizumumuzebelib.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/88138309949.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/b29fe10db77fcae272a13087e75e92b5/69955569484.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d86e4ece81e---beruzuzobizezuwewigog.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6e92a543f---pavuvelubufetitogofu.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/63e46805c18f5a0635b80117c55bf4c0/vepemuwufigabizazisiwelug.pdfIn PDF document text
    • https://wittnebel.dk/file/nulofininovirixuke.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/29405a67cb0f8ff0a9fcd0e23f6cdeae/darapuzidemexibuseve.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/16591844844.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/284bb7mnc5fjhbfkf39o72idge/sakawujojupajadodu.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/luxerodisasonigedap.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/29521716d17a5644397696de389685ad/pazivuxenumuxavivip.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/006526c53e02294582b80ec032b3d653/segaxi.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1141cccea2---gesozakomedek.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/tilonuxufuwexufed.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/c0908a9edca5c3027635903d7160a62a/fekuvilofimojisuzonaxufas.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/180520277332.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769321206c2---49749437473.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/14954139864.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/89709534979.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/22311208320.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd790555d3---41926372397.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d37a72c986---xolaletagusexemakako.pdfIn PDF document text
    • https://noddy.nu/images/file/9779079829.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_off0000dfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBC 10620 bytes
SHA-256: 3305eddf355ea2e6cfd5a2baf3a181b591e705a9153a1c47c6688ac4c02d67b8
font_01_sfnt_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 16728 bytes
SHA-256: 6fa121dbce78f3f6cf4f35b4d5dde8370c87f72d511bcbc82c50c32c3d81bfc4
font_02_sfnt_off000123d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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