Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c64392de55066dd…

MALICIOUS

PDF

54.6 KB Created: 2021-09-16 18:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1fb7fa4ff46b1aedf39add725029d03c SHA-1: 5c414c668e5ddc2871e9a5de6672d91086d1bc3a SHA-256: 5c64392de55066dd552230068da89b8b956380912b7bb338fa6f5b89ab734071
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8104

Heuristics 5

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=4k+video+downloader+app+for+android
    • http://epilia.com/upload/FCKEditorfile/gawez.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/23fa28af3d9039714121ee03b0cd93d2/90134446940.pdf
    • https://ssekolkata.com/ckfinder/userfiles/files/xenilolamirizutiri.pdf
    • http://studiostocchi.eu/userfiles/files/rutizozununisazo.pdf
    • http://bitite.lv/media/txt/122/file/67755026079.pdf
    • https://ildiko-szepsegszalon.hu/userfiles/file/44596050242.pdf
    • https://pima-alarms.rs/slicice/file/nawuratomatos.pdf
    • https://patc.fr/imagesfile/tabezodafara.pdf
    • https://currenwatch.myhost360.cn/file/upload/files/09-02-06-29-42-92.pdf
    • http://gpe-el.pro/ckfinder/userfiles/files/26039139301.pdf
    • http://agnieszkapawlik.com/userfiles/file/kidiromoduxodamivijo.pdf
    • https://ms01bet.com/contents/files/noboniron.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/10349f18bea5b310a247d377b51f0d50/puguxiduponobonepalaminep.pdf
    • https://ahha.az/userfiles/file/sejedebesuviwe.pdf
    • http://animationcoach.com/userfiles/file/wewitibamijukofololubo.pdf
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/rawazimiw.pdf
    • https://gangnampools.com/contents/files/vijaxutenu.pdf
    • http://jamxmpharmatech.com/upload/files/661833923.pdf
    • https://divetechmarine.com/contents/files/lixokugazejujezudejafow.pdf
    • http://driver-jazda.pl/upload/file/kidetuwesukizot.pdf
    • http://profil-metall.de/content/uploads/file/64276742153.pdf
    • https://masini-de-ambalat.ro/images/userfiles/fojedapotonopanexo.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa46880228---77767145008.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143568e8088d---xanedofitaxuvedemikor.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6d1.bin
5493bafd8aa62423e1d5a3c2431de78b95feea959e194a1945b877fcaa15458f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D1 10452 bytes

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