Malicious PDF — malware analysis report

Static analysis result for SHA-256 507954a8a490d552…

MALICIOUS

PDF

92.1 KB Created: 2021-07-01 17:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 1d98d8098b4afdafb839927b0e8b423e SHA-1: 53d025cace54cd6f304101e17333b9d594a72f01 SHA-256: 507954a8a490d5527c9d1944811a1036c19d7c65eb5819d5e820e2c272c29f21
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to distribute malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely a fake invoice or payment request to trick users into clicking these links. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/skin24lge274cue557o6qlmn0e/rolovotoxexupoderuzixuri.pdf In PDF document text
    • http://theheavent.com/userfiles/files/tarerogutogumuzimiv.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/mapasetudekug.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/55579823585.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/jigowobonukurepiz.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/647njojsnftmv0o6iq409ih8jd/74605820435.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/xiraxulij.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093538c906d3---wagili.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/2de52a0d28d3b4cd4e85a69f055d6130/gamul.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/fugekakamezimotofikem.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cde000cca9c---mafepufeximew.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/59597369008.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608844f4b8d9f---mixemazuzokaxotikabisu.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/11703422436.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160db060dd92ae---punit.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ee9e93896---64135626720.pdfIn PDF document text
    • http://aplus.to/userfiles/file/65053350368.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/kovisesegibumalasixer.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/melufiwewasog.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/sefoputatagebe.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5d1e86a85---buxarexirefi.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2a2b776d9---zatifovobewulubosabas.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/79006628376.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/7fd55c47f1831780a177dda3c157e1bd/desiwivubidobilomokam.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/uogdti512gi7p5qd73fdus3uec/zazagigoturekaxal.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30ccd059b9---67347842057.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/sofisotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=reverse+charge+servicesPDF 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_off0001088b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088B 10252 bytes
SHA-256: b7cc517be59f918034767c4bb0dd40a54e40270097a3d7414eaaf524134bceaa
font_01_sfnt_off00011fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D0 16652 bytes
SHA-256: b7d47ed4048ae5a9e6dccf7171289ab713e5354a8adddb7c46ddab8525420e6e

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