Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d21007c1d1f392a…

MALICIOUS

PDF

72.0 KB Created: 2021-09-21 10:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 27248573824e070b3a62bd3c8733aeab SHA-1: 9ca1fe52395f7b9fe5dd09cb5ca9ecd19388011f SHA-256: 2d21007c1d1f392a796de34e062510b9fa4949a97b888b50d88274234a9e7857
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to various domains. Several heuristics indicate that some of these links are hosted on compromised CMS upload storage, suggesting an attempt to lure users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4060

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://mundolibre.cl/uploads/userfiles/files/56037497809.pdf In PDF document text
    • http://opsir.eu/files/file/48136428567.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/25575143503.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/paruri.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161421cac16053---tibewazog.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/161325bfa88f11---gadikomivazixuxakuz.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/lototuliv.pdfIn PDF document text
    • http://rhondachem.com/d/files/24424209121.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/72172300527.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/55410427739.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/31706339562.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/83748510224.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/josovopazit.pdfIn PDF document text
    • https://rm-parketi.si/uploads/gojagopif.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/zekimutufurawuzakikutoj.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/97097451288.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/75878260661.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/37579139866.pdfIn PDF document text
    • http://mweb.cz/images/file/gazok.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/xububexu.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/56738840382.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/6cd7928d5208a582f8ba9195b43a8ec4/86158465079.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/d2c281ec0781044b87ace1ea2342a922/79520003723.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/88535851365.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3272ccf4efa1ece772c52e48e0dbbe38/7752563431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=superuser+x+free+rootPDF 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_off0000d3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C2 17228 bytes
SHA-256: 2a54e54b1986cf2bab99eb18d485f522d0dad675898e8889b54849af179f5392
font_01_sfnt_off000100b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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