Malicious PDF — malware analysis report

Static analysis result for SHA-256 8455238be416286e…

MALICIOUS

PDF

83.5 KB Created: 2021-09-12 03:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 860f7f10796ebd5dc5a0b3a84a92d835 SHA-1: f6cb4f1c00d694e8179c96d6aca8e3bb5d204fda SHA-256: 8455238be416286e6cda83f3aeb7f698b3c41cb46d0aa4887c835d4e4510cdf5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d206c1ece5---zunijexiboxagikaxozi.pdf In PDF document text
    • http://dietaltop.com/userfiles/files/wesiwopatorenomebiwowabox.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/522b6a25f9b6cfa6a8bbfbfb62bfc9b9/jugobodufawizelakexiw.pdfIn PDF document text
    • http://sbkf.org/files/files/73478934258.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/83016170880.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16132abc2da548---49474379432.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136410be818e---99534743606.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a298c4c777---83024006470.pdfIn PDF document text
    • http://www.pvvc.cz/files/55372688802.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161343649ddf05---vexitipirovixefe.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/lolenibubusev.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372dfa29d4c---lexubisojatomipijav.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/xivukotukikuzofuwik.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16136bd4fe29df---tupupo.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/xibopuvozifamitafenapuvij.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/11278128680.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/22627547669.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/gupagevufavimapekomaw.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/10537653056.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/xamizuwaxawijexojuvote.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/dewuvomi.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/46555635809.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/70166924810.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210902142737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=picsart+light+apkPDF 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_off0000e287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE287 17748 bytes
SHA-256: af9dc59125991d5fdf5681cc82a12e46b894b2072328ae6d3464882b639d92e3
font_01_sfnt_off000110af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C6 10392 bytes
SHA-256: a84163b16caaded4d9b9b9b511246581077ca1d1f0e6df853e4a63595f26799d

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