Malicious PDF — malware analysis report

Static analysis result for SHA-256 5483467ce5d0cebc…

MALICIOUS

PDF

91.1 KB Created: 2021-06-28 07:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5286e8236474fb7e11cf020064c8ca21 SHA-1: f55271d59437bd8b86253fcb2e7dab6c57b678ad SHA-256: 5483467ce5d0cebc1214031956cb7015c7b4b1b3a84284b59ca1e7273559abf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://globeksa.com/ckfinder/userfiles/files/2011573304.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160767f509dd8c---kegefinigab.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607b85b10bf40---23077186790.pdf
    • http://hiddenforrest.net/clients/76790/File/pekibenekurosusukajufeler.pdf
    • https://syteq-pro.com/userfiles/file/76689737133.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160761f9df3978---nabalular.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/c18f5cfa108a568d72af518657c2b5b2/xewibebigamak.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/6tpe5sb7o87op14bhpd9inqgd3/27761045242.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9f6ec4d9---barisebunikajavaxigerovon.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5c44ad2c429da41da5003be71b6547e9/dolajalitij.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0cc2077ff---55253817970.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c081c348558---telemofagosabejafi.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/160719e24bc262---56678631473.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b33e95f59---nopoxiwatuw.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/14d88cff909fd18c4647ecf9def2ee4b/9128809822.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45907f189f---33474645161.pdf
    • http://baugeraeteverleih.de/benutzerdateien/fajutedewiwuzibujufaxe.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804f76cc356---16856147142.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/cc825f5208732af2800eb63f87a5ea42/76876854530.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c11d955148---wovajagozagezuxexevalebid.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/77bb67e837a584f970bb6e96024510c6/dezisujetuxe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=prayer+for+depression+bible+verse
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001028a.bin
626069f92d7b8a834770534b025712548cf9081086e3f203e729aff53d6a8cd6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1028A 17156 bytes
font_01_sfnt_off00012f2e.bin
ed0f908ffbceef32cf1b80d1cf79cb758dc7e5a8539c1702c0d769e4fa32f7b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2E 10712 bytes
font_02_sfnt_off000147a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x147A6 16792 bytes