Malicious PDF — malware analysis report

Static analysis result for SHA-256 01f16d6e1333c5b4…

MALICIOUS

PDF

76.1 KB Created: 2021-09-03 02:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9082735ee61d9079a315873032f21ee0 SHA-1: bb29ee336f591dd18bc31ae2aadd575eb395773a SHA-256: 01f16d6e1333c5b41dd676c3669cc29fe01c9d1e1242c570aeddb09cfaf1d742
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of distributing malicious content through generated or compromised URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8024

Heuristics 6

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://sofia-es.tokyo/yamituki-n/uploads/files/luniz.pdf In PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611b51fa8e499---58132315614.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/21dd7a12bcab9c0dfaa4004bd18eb736/96334340749.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/vumebikunawanazatu.pdfIn PDF document text
    • https://digireg.nu/upload/71148478267.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16079bc5a6599b---54112723305.pdfIn PDF document text
    • https://digireg.org/upload/rizupokilidoxibebigufo.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/99096664529.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/wowadakefogu.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/mebibevefajulezesajaz.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/16623627659.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129875337301---fojipotenoverikabotu.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/21541203315.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783dafc52d6---sojaru.pdfIn PDF document text
    • http://kotolantopeni.cz/file/53153523396.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf895e5db17---dulonog.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/vkdsnih99ogtd3craq7vhouo88/11644300798.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vb9v7rsu82mvihgnlnu5fjjun9/rewarimonemupikosid.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/getepabilikawaz.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/73655365316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ge+amplified+indoor+antenna+34700+manualPDF 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_off0000eb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6B 17772 bytes
SHA-256: a5c2fd09ff8a79572f776c6ac3e0e6adebdb6cb5f991be95e2224c192d7dc77c
font_01_sfnt_off0001198d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198D 11052 bytes
SHA-256: 5fc3a81479d0588de64efc5bdc70c4244dbfaf15c82928c8514bf86f4799fdb5

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