Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c00d738d56f8dc…

MALICIOUS

PDF

84.6 KB Created: 2021-08-01 13:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 392148a7b0bc6994b2bd5ccc6e8734b3 SHA-1: aaa28937d598aa67b86c23a8f799b4955e35b0a6 SHA-256: e1c00d738d56f8dcbe55f9ca7cdafe4a98e7e10c136f925fb48fd0e323949705
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised CMS uploads or hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings and extensive URL list are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8019

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://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/lek1nsonpup3jr0ulhjhcjsk37/xixexovi.pdf In PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/tasag.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/49067477904.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/92324174309.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1e20141841---94712719966.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/10317530837.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210714_153433.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/e1b74b10691f67d302f301e4ccc20b4f/2840591326.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/59713819420.pdfIn PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/83885067734.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/pesuse.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/jemurokoxivimekomevup.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6654e8f0fb---71698844846.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/98c470bfbe59329edafcd69f6208baa0/89594481591.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/eb07dd21bd4b7904aa66cc0ad4ebe9ab/nowiwovolafasetasud.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051601105773499.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094183a76309---xiwudabizuzot.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7148e5f78---nafodevatulanumimom.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/d3724bec7e4ffcbc0049e4e3b6659fe1/16944466328.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/22621156677.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5229810e98---96569934074.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fe1fa935d32---14766977419.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/27982637811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=alouette+partition+piano+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3C 10404 bytes
SHA-256: 11707a57b41c9670111c2e6328a544e78a2791ef2435fb4a842f939489801744
font_02_sfnt_off000125dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DD 20576 bytes
SHA-256: 986999e47b1125ac04984ebc45c78ae3b9ef5b7cc8437e6eafad7ef7901f4f72