Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ee32c6346d07d75…

MALICIOUS

PDF

89.1 KB Created: 2021-08-09 11:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9dd3d58babffc6f1dbb39785ccedfc55 SHA-1: b9114b70953b213c0e0186d38c5c7b5ade969b2c SHA-256: 1ee32c6346d07d7593d5c3e7fda1f690d0a8dd448cafc70d92c9a5aadca8bab3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be non-readable content, suggesting it's not intended for human consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b698d003d---76591611102.pdf In PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf17c53b3a---wekugajolodopop.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/52269390991.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bbd9089be---9022332796.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2eaf8b93ca---bepuwevodotebabedebe.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/43374999811.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/75791927746.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/64075763081.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/gifobiji.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab6ad7a8bf---xixanogur.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/78948580281.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/mopemesirisiditajag.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b1adbba143a72aeb348648237fab05a7/peraxexogatirokisufu.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/3277693458.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/sobidawova.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/lafabakanezokevu.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d060a0774---baxorilax.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/82722157963.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081441272832---80497092767.pdfIn PDF document text
    • https://tmtteks.com/files/repenifejaletoraw.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/a374b9a4bfd4a9dc3d11c937c3c8e2e3/xobexipafogox.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/30921653799.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/robisezikuwaxilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=propiedades+f%C3%ADsicas+de+alcanos+alquenos+y+alquinosPDF 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_off0000f12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10942 10936 bytes
SHA-256: bc105fba91da7307d64a762fcdf35386a8631bfb07f0de878dcb8eab7cfe9420
font_02_sfnt_off0001226d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226D 18972 bytes
SHA-256: 1dd542d074425c94d1e6402387b6c6a87d1cab405dde3b9f631fbbf03c47b969

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