Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cfb6f5e7d1bae3a…

MALICIOUS

PDF

73.3 KB Created: 2021-09-06 15:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 15cc602460a24d29a93d8aeecad53faf SHA-1: 087575b8df7f537331ac1b12e419820b59038245 SHA-256: 9cfb6f5e7d1bae3a83f65b2a482597595d07aef1ec0da4c5cdd617aedb0dec33
154 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, several of which are hosted on compromised or disposable domains. The presence of numerous PDF links and the use of 'utm_term' parameters suggest a phishing or SEO-based distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8295

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://hometeamcorp.com/images/usr/junewadogijekokidagow.pdf In PDF document text
    • http://vanharteyoga.nl/uploads/files/fabubo.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/fevijirel.pdfIn PDF document text
    • http://www.moyekolodin.com/files/35925508252.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/nunevekewevujine.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/13558266354.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/hsdke08ml5ang4ipkb0jh3t0j4/24593905183.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/50289038817.pdfIn PDF document text
    • http://seamacros.com/upload/file/26827713481.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/50665984306.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f273acb5c7---tefeferuvufome.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/21398329098.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/laroreruwijebura.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/11664844618.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610ab5a60909d---bibedo.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/323b9fc05bee641d9c22cad468e0ba35/devozewomubes.pdfIn PDF document text
    • http://pronobile.de/catalog/file/xazexab.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/474bdaa2c8d0c03ae07da92f9f089426/sotosavuwodatagevogomejaf.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/fv1cti4obppkej22ha3o62phhs/dotuwudikutuzezugun.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/tozujasaweduxovijomuzaras.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160be1d93397bf---72961669880.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/varavodaseruvaserizug.pdfIn PDF document text
    • http://novichiha.ru/pic/file/surewunej.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/rusinewipuzibevukawazom.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd88d680b0---xelujofamusuxipegiwajoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=strategic+perspective+of+compensation+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_off0000dac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 11060 bytes
SHA-256: 7b79567012174c240d56c8eeaba3d7916b5e81d39f0ba2d0144f0b120c6fcad8