Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaff4969cee9b12e…

MALICIOUS

PDF

90.8 KB Created: 2021-08-07 07:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 92d468f1b641ae36f518a8177058fca4 SHA-1: f74fb5dacc11fc458f153906e7114aa0f1371bd9 SHA-256: aaff4969cee9b12eeac77ad5c186d58af43b0ed8ac61d4fba789eec22f50fa94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a phishing lure, indicated by the presence of a link farm pointing to compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of an attempt to trick the user into downloading a secondary payload, likely hosted on one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/cb7da1ea6f1e0d16685a20ed218eb0c0/bubosuredido.pdf In PDF document text
    • http://altiro.nl/home/tjerk/file/13609109648.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/vibere.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///34971555287.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/98u2stlsv7ce222qr5smlkd516/46620895813.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/82857697551.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11c4384bb1---wivixikig.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/muwaburam.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/11067655492.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/nilukusopipozefanobewavi.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/59618072513.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/85463848088.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160722bf10845d---59855146058.pdfIn PDF document text
    • http://beiks.info/public/file/sunilenogeromudidol.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/b619441e59361351ef28df685b956881/5969900308.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/44cedf0918efe69d4971fe3288beecb3/dozuvobidalijexisas.pdfIn PDF document text
    • http://humanlitech.com/files/files/66707744617.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/63552a02aea583604f8772a8504bb0ad/rapilovilaxomani.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08613946cb---timuwemela.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/591aea321c5e852e620b05693a4dd7c5/64337969577.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202107/1627081540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+scorpion+king+2002+full+movie+in+hindi+download+720pPDF 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_off0000f70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70F 11568 bytes
SHA-256: c15d1d8300f048df1cd38ea0f03c892734d663a7937d2d057405a510de4df8a8
font_01_sfnt_off00011244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11244 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A56 19164 bytes
SHA-256: 96d1abbfd2e472ae5dcafceece146a6e2a579bbc649366abc35abb56ebb1f50c

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