Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f17d59888723838…

MALICIOUS

PDF

78.9 KB Created: 2021-09-02 17:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 153c360cb008b52934c7efd559fe776e SHA-1: 9df68ff8b186b337a4497dff56aab66e9e14a274 SHA-256: 3f17d598887238388592e0ab4f24f423d2cec8a3419cd711fafc84c0c66ccbfa
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs and the nature of the link farm suggest an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5347

Heuristics 5

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=online+oxford+english+dictionary+pdf PDF link annotation
    • https://kajariaadsevents.com/admin/uploads/file/dixoxixaxobuzazowigoru.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/37991079738.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/17214144106.pdfIn PDF document text
    • https://citronel.com/userfiles/files/genenuvirutivorife.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adf52e8b182---38512956582.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/f3f91dc6afd69da9a32044631349a300/pupegikap.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/megagur.pdfIn PDF document text
    • http://amandamaitland.com/images/file/28935430892.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/kevodafewojaw.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/50664724442.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161209d3edb9c7---91739544577.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df618b95570---35676723122.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/fikom.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afa1c8dee57---lusesepogoxur.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/7ce9607e8db6073e8022d110dcefeae8/mamizuludusurirona.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16277896029497.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed0b5db15e---17781501810.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/sidexafudutidisomalosid.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a08f029f560---kavodaxetejaporufajenajit.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/93589111596.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/99073109476.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076267e9cea8---seximanasowibuboje.pdfIn 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_off0000db92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A4 18596 bytes
SHA-256: 2984df170d5cbb1ef23fb77863f6a338542b4679d686329d2a66e70a4e9efe59
font_02_sfnt_off00012426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12426 11140 bytes
SHA-256: 51ff115ef7c5f93eea5aeb270405208e81e6efd51cc08b8d9ca2dabf5dcf9ab0

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