Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e92d6d8d656adcc…

MALICIOUS

PDF

76.8 KB Created: 2021-09-13 15:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0219de7d3537a94998b5a8b101266fb3 SHA-1: 7b109f7d32c3d19f3efc77415563aa65f460a3bd SHA-256: 8e92d6d8d656adcca70142b3251d61905ab8722ff97c3c2dbfce7bf3f9f289ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to lure users to phishing sites. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic firings and URL analysis confirm the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://svenskafik.se/uploads/fckeditor/file/28198297673.pdf In PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374df73f3d8---28421096320.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/42963680132.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/xazegurikalekuseluzuzosa.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/jinenolitisokuv.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134c84e2315b---zemowufukowirera.pdfIn PDF document text
    • http://dmkert.hu/files/file/guwoki.pdfIn PDF document text
    • http://melabo.com/upload/files/86540197374.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021090313480270554.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/36769547181.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/29943440268.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///49944841970.pdfIn PDF document text
    • http://megalaserasia.com/upload///55347768852.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/8a128f6c0bb3ce69dd1f32e215f62ec1/rubudawoxisuxe.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/basivafid.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/fazorokixojumagavixojotax.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/besamalasoretupejodigu.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/m0ju8mktr9jh4iqico5f6acp6m/bamaxufoberazinotu.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/watol.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/57321206405.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613700bd4005f---jidokamulanatu.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210908081740.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c26427ccc6---wokazilewatodavip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=difference+between+xperia+1+ii+and+5+iiPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB923 19748 bytes
SHA-256: 4c574211425b6c68d54bd45bac4275dcf8fa1a55fbd85fd886d20a6a7f5f44f4
font_01_sfnt_off0000ebd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD0 10796 bytes
SHA-256: fbc87040f1b21b5c02a4758b1a7f6c25235ffa98d4b98e7e1e66e3b6b718cc8b
font_02_sfnt_off000104bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BB 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00010cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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