Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55fc40ae5397757…

MALICIOUS

PDF

86.4 KB Created: 2021-06-28 23:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: b7aa564e34f1a1b839a969ce2a9f88d1 SHA-1: 79babbb6f918df97681a692cbd883c513903bcd2 SHA-256: f55fc40ae5397757d9e0a60682f5fd43b63ffa585b6d91499804838487c016af
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to host PDF files, likely to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/76fc8320bb541cc755e69e40c225d778/vufuwakimofikerubamimeto.pdf In PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/qlrs92ad6euf51nhpvpfpe0hcf/17879090046.pdfIn PDF document text
    • https://digireg.org/upload/5752795875.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608657ed63c3a---99033548419.pdfIn PDF document text
    • https://ski-experience-japan.com/images/blog//file/75012896045.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607617cbd931d---megovaxeduvutisir.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc64f85d0e---vafisubunazafafe.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c2ac6397e---6957782025.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/90750680514.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/teligusipixe.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/zurawajumijen.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160945f89e328f---66313357638.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/4d10918c8f3b057e42be8864ae36f73c/tafokofexekumakeliz.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/32694897515.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d6bcac1d4f2---pokogi.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/v05gkt94mlri4nfir0v4branj4/wedepudebufuxexafopevejiv.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/54868598997.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a960801930a---39134789438.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794f3652284---71089623559.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/66c12b67e92d9892319a628feb6e45bb/55962854726.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/98091349535.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccbbe5208d---21139279934.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/31473380567.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160d06b8fc6b0b---sosajejivuvuneposuzuj.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/40c1b9dd41543d1f564e16142a56a1d6/86113454522.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/4eeb5c79dbca723670a0a24ccf20490e/nuguge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=watery+eyes+in+the+morningPDF 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_off0000ef9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 17124 bytes
SHA-256: 66ffb155060a3b9b29f251c1ef12246630d589de3b7e7d73132b49949998aa66
font_01_sfnt_off00011c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13454 10616 bytes
SHA-256: 17ed132a08af1ba39658fc84dee56effdf17560a2fe0353e800231a8b8e0b7d1