Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c9764c67aa3eeee…

MALICIOUS

PDF

117.1 KB Created: 2021-09-20 02:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6a3d1d8b65366ddec4bb751e8538fdd8 SHA-1: 176df1e717a935a2d5076a4e3d4323ca7ea3036b SHA-256: 0c9764c67aa3eeee318904cbe38e48d3e3a34ed895b6a310681f91833d62801e
124 Risk Score

Malware Insights

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

The file was detected as a PDF phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various websites. Several of these URLs are hosted on compromised WordPress sites or disposable domains, indicating a potential attempt to lure users to malicious content or phishing pages. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2565

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 http://huefpdf.org/upload/file/lobetaxafazajepolewaru.pdf In PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f502367485---40940096322.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/butikixum.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/61382285092.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/46054656972.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/tesufemixipebewel.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/fbl836rgg36bk52bgv3ke1n32a/zikigumon.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/dudupatu.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/rowuwopuriwojewuwite.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/wunutara.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/pameruzuzogef.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/movazojijopapagewofox.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613af7c7015c2---werefejusadalosevonuji.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/31742310413.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613a65bb8d05b---96334030337.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/72976377198.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3763c1297---kutuxadale.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/nerovomi.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/fufufosejosabubakutup.pdfIn PDF document text
    • http://wjcopy.com/upload/files/17689660579.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/52054563290.pdfIn PDF document text
    • https://cardolf.ro/files/45611823228.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/j79fddk913ffue228fgp56e2l0/fozenez.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/43745756780.pdfIn PDF document text
    • http://szm.hu/userfiles/file/gadonafizonit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=algebra+trigonometria+y+geometria+analitica+stanley+smith+pdfPDF link annotation
    • 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_off00017422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C39 11300 bytes
SHA-256: 5cecd63c833e6c65823fcc479cc9ad453eaa96aed84dd06f7318cb0170e572d8

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