Malicious PDF — malware analysis report

Static analysis result for SHA-256 87667983c04bb11a…

MALICIOUS

PDF

78.1 KB Created: 2021-07-23 21:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28b2ab429e06c16d017c12cc20fe466c SHA-1: d5aad5059073d60d4b377de6ea01838665e3050a SHA-256: 87667983c04bb11aa29f2af2b76f112e55532b2a312266d8d064d57c66359d08
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple domains, including compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9011

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 http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/0e9db96245af40818a512e9cc3c65886/92580132081.pdf In PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/95537629735.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/61903966384.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b39d1b95f41---5300776807.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/61880123920.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4c1b15142---vijowitijotimelufetosi.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097c59912dbc---68704095443.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021062307541473499.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0358d890c---92466494568.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/50209928585.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/7fc41d3b125daa21d404945d9e86d912/mefurepimet.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/31209763133.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d7cd9f2fa---53246478775.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d67d451c7c7---49423857743.pdfIn PDF document text
    • http://soupworld.de/upload/file/tekaladiniwel.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/13679415098.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/25737328244.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/wofeme.pdfIn PDF document text
    • http://kleiberit.ru/files/file/domexajisilovudedosud.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/rivibobadedapo.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/d8d500d4d176c7fc44c8c6a07829892f/58053401685.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef61080e9e---72131577068.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/5658430917.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/getexewa.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/kotenopijesavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+was+the+major+result+of+the+treaty+of+guadalupe+hidalgoPDF 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_off0000f9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C5 11264 bytes
SHA-256: 5dd92f52cd133f41323c66a52275d1f6b1cfeea06a2241472b4a2cb5d73ebe1f
font_01_sfnt_off00011404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11404 16904 bytes
SHA-256: 72d9a0634f69a4b03f939de712fb2ca38dbe5477dcf37186fc641e41150f3ac2