Malicious PDF — malware analysis report

Static analysis result for SHA-256 f799a8191e7e84f7…

MALICIOUS

PDF

92.0 KB Created: 2021-09-13 11:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a81c7196f86782d6bd3513fa9faf89df SHA-1: 5ada6956de9588c9c50c14f7f822c32c349337b4 SHA-256: f799a8191e7e84f74a648420174328522b4c432f89501f195345c406b6bda998
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to multiple domains, including compromised WordPress sites. This suggests the document is designed to exploit vulnerabilities or trick users into visiting malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://quiltingacademy.com/fckeditor/userfiles/file/38851117842.pdf In PDF document text
    • https://indicaperu.com/userfiles/file/fijofajazazilorokarozonoz.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/tuwikadoro.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/nipipo.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c29030a369---19483970347.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/34304206061.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/xikodur.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/fokenevoguredamikokagaj.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132944e6ed3a---namaxufitoxutevigeva.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/xefumif.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/89052550746.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/dedefufajapasunev.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/zenufamumux.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/53316903224.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/riburunumulemirim.pdfIn PDF document text
    • http://dakov.hu/_user/file/zikokejukikakaze.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613302cb770ac---3820216327.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/18951916695.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/wajevujasawozat.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/fimabadokajadasezagum.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/kokexigevufuv.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/vatokila.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/44692369418.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/tutetigugi.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/gitama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=midnight+sun+twilight+read+online+pdfPDF 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_off000103b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B3 17544 bytes
SHA-256: 1b125c168c7ea7836e7b82e8e40de72b09dc7109e131724136b7634dc6eeb363
font_01_sfnt_off000130d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D4 10956 bytes
SHA-256: 616436ab5276dbc9ab249d6ed551c35a6edd76ee55cec0935088e270cb5cdd94
font_02_sfnt_off000149ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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