Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4368f5d4e145e52…

MALICIOUS

PDF

72.0 KB Created: 2021-08-08 11:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e77c826e76d6db0e694e2798d94fff2d SHA-1: 984d6fd7fff799353d6ae1441cc1b1c8be905094 SHA-256: c4368f5d4e145e52688a391440caa57dfb50ffd06ec82f82311a5a41851a2cab
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6473

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://irollee.com/userfiles/file/10978155011.pdf In PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160823741012c8---devabaloxa.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/h7drk0ka2oscqh5e03u8300uk2/71679865388.pdfIn PDF document text
    • http://dringraldi.com/clients/7/73/73ccc230e5ee2b020474e4a43bcd07af/File/83871768558.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076911a5178f---lekamifipodijup.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/69489124903.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/as7juigqe8jlejji2rijc9acdn/50956036408.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/mvfjfg62s2ffo73tdhc0fdlglb/ladewowinolazaxike.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ct2i5f585rufvf130i3rega6n6/15390562136.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/8d6de4090a3f51dc4be1ec6bb9178a5e/xaxamosuvo.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210705224641.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9016357e07---xinapazexibuwezexumesava.pdfIn PDF document text
    • https://edarky.net/data/file/46882617705.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/91459298757.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/maxukexoxebon.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/83163942889.pdfIn PDF document text
    • http://jaqalsports.com/files/file/patetufanidunitagojifuluk.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/rololatuwuwikesowuxur.pdfIn PDF document text
    • http://cmepta.com/clients/7/74/74ea2f63c40943e6497cbf70acaf7c81/File/jasurepetetojesi.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/46226236063.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/navelatupem.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/9fe7c483a9c1f9793228c72c5e68a9d5/16082641378.pdfIn PDF document text
    • http://krupongs.com//images/file/ruvil.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/ragagejes.pdfIn PDF document text
    • http://www.pilartangguh.com/file/deviruzudijatobirip.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3532610df0---dufizopadegorovasige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=8+ball+pool+trickshots+mod+apk+1.4.0PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 19808 bytes
SHA-256: 118fad897e7308548330d0550203549763d375c680bbe71be772e52a2944afbe