Malicious PDF — malware analysis report

Static analysis result for SHA-256 4252fa5598d741d3…

MALICIOUS

PDF

73.9 KB Created: 2021-11-15 10:29:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-15
MD5: 596a6550c9c5397860ecfb071db162a6 SHA-1: 2283ef0ed606e9b323276331c6edc1326a7c7bfd SHA-256: 4252fa5598d741d3f066b09b30e26106db0391b3d0eb9023658165b98d50ca3c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm. The link farm points to URLs hosted on what appear to be compromised WordPress sites, suggesting a phishing or malware distribution vector. The embedded JavaScript likely facilitates the malicious activity, such as downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://szallas-karpatalja.com/upload/83476082053.pdf In PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/kijutuwasab.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/17232735336.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/49581410990.pdfIn PDF document text
    • https://skl68n15g-n2ox.com/contents/files/62707163073.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/mumilubobizo.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021102415638.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/kukusus.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/86425228855.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/vugesemufomuzix.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a03ca9640a---fabupukupotopalozof.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/zazozimed.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/40057105749.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/16537018966.pdfIn PDF document text
    • https://binhvi.com/upload/files/82938853892.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/panonasujebezuzewekaru.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-11/file/8434421556.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/dowavudezulef.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/466b3203dbc6bae8edfd8128fb1fa3fe/65079199835.pdfIn PDF document text
    • https://aventuraholidays.elladatravel.ro/mm/file/23013593669.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/sumalapagapurorej.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/xonigowilugenijutilas.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/55278946048.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/867a63fbd9eaa8db8893f3e00813774d/58109591148.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/xPAns0MRe5M/uplcv?utm_term=mixed+fraction+into+improper+fraction+calculatorPDF 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_off0000b972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB972 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_01_sfnt_off0000d093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD093 18560 bytes
SHA-256: 3292efdffcd5daa1ec29b2383dbb887e74ce4370086a012dae049cbba3647702
font_02_sfnt_off000100bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BB 10808 bytes
SHA-256: 5e98ed68d3338d7e2d5ec199b04028a49f689c648ac060870674f3e097ac57b4

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