Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8da52de84b30d6d…

MALICIOUS

PDF

78.9 KB Created: 2021-09-03 20:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7e2f5ae0c34d459c1a4f48e0f945820c SHA-1: e7eb653ddce7be3f5296d9c94b6360814482e817 SHA-256: e8da52de84b30d6dded80d025d31ffde3efe88854a249a0a30c0f82a62956222
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The primary function appears to be redirecting users through a series of links to a final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://wastran.ru/uplcv?utm_term=peerless+vertical+turbine+pump+installation+manual PDF link annotation
    • http://3q1p.com/upload/file/210715194526985192vn16l36jmmsl.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea766c2683---78917113959.pdfIn PDF document text
    • https://starbox.fr/img/files/12149029547.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/17216310653a79fe13fbd0104433f7de/29986060089.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/bululolotitil.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/55524154036.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/75894219970.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/pavuwulerijiwoji.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d93d17bd6b3---51486768848.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1fc45d6f9---gidijamafut.pdfIn PDF document text
    • http://checopharma.com/upload/files/82616466419.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/94844004556.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/9b4c8ac06d65ca26b89742b6b98b0df3/rubulesutezadikigabemen.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160da20c8bc5ba---76126990173.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/54622268764.pdfIn PDF document text
    • http://strap.sk/uploads/files/88225251731.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/dewamadafijowosexerotowi.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/xutovunifam.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/djvkuof0nsr7lvq7nqppejdt2e/21275095823.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/3114b10aee29cc3ec956b8935385f991/muzizowazeniriduka.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/gelelejubiregir.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e89e237d1b6---kazexukap.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/xulekusakopalitewefuse.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///67369046889.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/velobuvafixozufanepip.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f781b3d07d---lerafatedosinakemas.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_off0000ce80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE697 10844 bytes
SHA-256: 11c465226e7b103a9d69644911c7b89a9ec674f9ca152f89f1625beb5eae1d2b
font_02_sfnt_off0000ff6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6A 18408 bytes
SHA-256: acde42270bf2da15e551c4b6c468c8c9fc6c3fb9aa99462489a313fc3276a7f5

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