Malicious PDF — malware analysis report

Static analysis result for SHA-256 27948eaf6c28aed0…

MALICIOUS

PDF

87.1 KB Created: 2021-08-10 20:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 95af4508e31aad54877026ac49f21d02 SHA-1: 5d2f05c02441d4fd0e1da72254a0ed3404d16b73 SHA-256: 27948eaf6c28aed0841bbb0fbceb069605f1e2fbdb0a58b02202f1e63bc4f32c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely lead to malicious content, although no scripts were extracted to detail specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://agataklimowska.pl/userfiles/file/tupovalulik.pdf In PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/015cade210c949a492bc39672b555027/forufamemaximopamot.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1ffb5776d---94970238532.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/95096462211.pdfIn PDF document text
    • http://hzbaoyan.com/images/upload/File/98151313154.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/zavaruron.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/pibutomavurebakize.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bc30867c7---sivafaba.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/11493963001.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/09aab039c5d31aaa39e76351d7bea9d6/56154049438.pdfIn PDF document text
    • https://roc.mn/uploads/files/dezubejezuvuroboruxuxel.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/kujewagamewejuwug.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4f8622407---podujuxevativodexa.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac208d78776---muxukejaruxosabixi.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/51379451829.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/eedff8b84d30225ad471186adad3d50b/67501660241.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/e619b55e373d1765e3aca24f573faa5f/88929090525.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610d185ab41f9---bozerat.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/82075939426.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160beb273d7eab---25752881401.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/dageduwozakuxaputezuxiwe.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/l4tk3qght7if3h5jbrds2650r0/gideredixobumenabapeba.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16103bce3a9cc5---neguj.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/wogunuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=fidelity+meaning+in+nursingPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000f3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F9 10664 bytes
SHA-256: f4300ed054e3f78f319832f9d2914b5f20e9cf06d1af26f8ec9775023eefb214
font_01_sfnt_off00010c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C20 16276 bytes
SHA-256: 6dcb776cf4d029434ee0bf809dbd0a0826c301f00b52d23bda67f7082f12d744
font_02_sfnt_off00013633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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