Malicious PDF — malware analysis report

Static analysis result for SHA-256 f248f8458331e429…

MALICIOUS

PDF

87.0 KB Created: 2021-08-24 12:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 11fc9b04c83cd017e484fdd8138444db SHA-1: 90b1392545104b53a4d7c6419b965c24cfcf15f0 SHA-256: f248f8458331e4298c3e4e70f3acee8c36cdd3addd61121b1327df4632ddb5f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external URIs, many of which point to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were extracted, the structure suggests a link farm designed to redirect users, likely as part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160812d0b5f306---77463436414.pdf In PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/rawuz.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16093e8af5029b---98513614803.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/201206c98df9b871864d85082d2fa3d1/42082736907.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/39733262301.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/325394b2fdc053d4c8a41e92f7d4c40d/rinefageruxixarafuxapa.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/dulimajiwalula.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/687de306e04526bdffddeda904f93233/woditaxanemanusavoga.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/1672670051.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096d528bcb36---96183990042.pdfIn PDF document text
    • https://senhewood.com/d/files/bopobulaviki.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/baliweredawu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1611d969468c4a---kosolesopibasagoxodewoso.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/75747082840.pdfIn PDF document text
    • https://geo-decouverte.kenamedia.ch/ck/ckfinder/userfiles/files/lemawuxuxivikav.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/gazowaxel.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/vusewajo.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/76e34abf0cf2a54a4aaf3d5aa7ea546a/daloxomawijepukikuzeko.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/11872813360.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848feac0d59---fejuxisufufoziduwidapox.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/mivirewomakotufolek.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/japagasavimesazusavatuw.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160724c8dd64e1---13474282654.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=good+bets+to+make+with+your+girlfriendPDF 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_off0000ecab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 11372 bytes
SHA-256: 4de75ab0363a265f52e9068bc64772f8ee992e9ad0b0af953414959ed3ca9017
font_01_sfnt_off00010729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3B 17488 bytes
SHA-256: 3e6c385b06e45d7d1a95d2bd67bbd7789f74d879d8a0f865480ff8523bf1c782

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