Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aaf2eac55db6f77…

MALICIOUS

PDF

63.7 KB Created: 2021-09-06 15:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7ac16a77332728b882653d5aa2e4416e SHA-1: 3b753d0ff814eb9b18e60c931d9ae3ebce4a39ed SHA-256: 7aaf2eac55db6f77c54e7e3ffd304ca04a88410e692176cf1176e72f9d0bb5a7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5661

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://ketchas.ru/uplcv?utm_term=106+geometry+problems+pdf PDF link annotation
    • http://usefchina.com/uploadfile/file///2021081309511353.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/vurirawisufadaraxegire.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/barerokowuma.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/gp05a0956h15m2jm9r8opabi0r/xiwezoba.pdfIn PDF document text
    • https://digireg.cz/upload/15003213235.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/nejukowumesoxusinisutor.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/67620123527.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1755aa8a2a---31886634175.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6734315af---24407281082.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/49ddbc1ff572e815813a124a81723407/zokimojekifelusutojibik.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/123ff0714a6e5116ce0d9e7aa6c00e7b/xalumazoxe.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/51105981797.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/86a7230d87b36a857365ffcb30043318/pewudizedixobesegepapida.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba8fbb9d77---pexureto.pdfIn PDF document text
    • http://kaies.net/upfiles/2107280903431936989hr50a.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/89542896028.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/pawevove.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/norajijadatetexiwujog.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/99812064195.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb3fb5d144---9298279214.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/gumodarabatovu.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607393fb7583a---motanarofapure.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/60479513009.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/tifuwegafoxekaxitubowerij.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34E 10984 bytes
SHA-256: 04d675890074e483a83542ecbb63c623f03aa3a6dd55e6486f047bb469056819
font_01_sfnt_off0000cc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1