Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37bad88859e5356…

MALICIOUS

PDF

71.9 KB Created: 2021-09-20 00:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 460afed32b138e5f9f3e86cbb57522a1 SHA-1: dbe04c8bd49f124dc9b7fd56e982e2a7f533a591 SHA-256: f37bad88859e5356899d635a3e8074c64602cf30e8daa7e93280a4e2863a4c39
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, with multiple URLs pointing to compromised WordPress sites and other domains. The ClamAV heuristic identifies it as 'Pdf.Phishing.Trojan', indicating a phishing or trojan distribution intent. While no scripts were directly extracted, the nature of link farms in PDFs often involves JavaScript to redirect users, hence T1059.007 is included. The primary attack pattern is likely spearphishing attachment (T1566.001) to lure victims into clicking these links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4060

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://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16147a78234c44---vebopax.pdf In PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/75914600734.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/66352847557.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/92268450747.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16147a609bb13e---51590404717.pdfIn PDF document text
    • http://brukbet.com/user_images/file/39663489215.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/rimib.pdfIn PDF document text
    • https://kopari.hu/files/file/32442269305.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/rejed.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/gutowalemimezuxonuziju.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/rijozoleje.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/57103213511.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/tunikodefusamirujesabodis.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/3374957199.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/80888795999.pdfIn PDF document text
    • https://paperland.bg/uploads/file/27581439798.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/farivone.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/xigebubawazidatetutos.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/gebazujukirif.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/17931499712.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161343ab97868f---dilodotudux.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/vapejopag.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/wujigibadavefomarezoneb.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161413fde6e060---17218039143.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/misimuxibonadabexig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=business+economics+by+dm+mithani+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_off0000cb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0C 16764 bytes
SHA-256: e15ff3e66987c2739b801e0e15d5c07e75ee239717ed597c699d3a42d35992d6
font_01_sfnt_off0000f6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1