Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffdd002f38fe7a2a…

MALICIOUS

PDF

84.2 KB Created: 2021-07-08 05:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bd2af31f866c7e62d5ea739076529067 SHA-1: 7d646fb4da982f399dd857270c5d727cbef342a7 SHA-256: ffdd002f38fe7a2ac5a3d1443e00677a88ebf7f8b02a64350d2823cb4c52885f
96 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 WordPress sites. These URLs are structured as a link farm, suggesting an attempt to manipulate search engine rankings or redirect users to malicious destinations. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4557bd0f3---tudejen.pdf In PDF document text
    • https://accuratesearch.com/userfiles/file/suwalilaxidosutofomuwab.pdfIn PDF document text
    • http://billsky.ee/files/file/9759864326.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/49431096380.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/d0f8ac5582726966df0e575bb01807f7/84066538951.pdfIn PDF document text
    • http://vodnik48.ru/content/file/76543471583.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210624_081922.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/23a02456baaf1e6396d0269b97f52daa/91649505028.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec349e99b7---vasesivekogidugaverik.pdfIn PDF document text
    • http://watsonwilliamsreunion.com/clients/82103/File/13721162179.pdfIn PDF document text
    • https://hoalavender.net/upload/files/58291255206.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/31474225498.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/bf9e5232331c0a294c26d7ddcd6f456e/34818030823.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095963e87472---domux.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/jamujidapuretujubegasejir.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/18958925230.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a082df3504b---pijelavatanem.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e0988e9db---likejoxepuzoziditetupin.pdfIn PDF document text
    • http://rilta.net/userfiles/files/31392223675.pdfIn PDF document text
    • http://jonmechina.com/ckupload/files/36285519427.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/tugotitefavasowev.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/fbc405f708b83dc24f03373ae8c01cc8/ronarop.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/bavatalotulagirobumose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=demand+planning+and+forecasting+in+supply+chain+managementPDF 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_off0000e6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECD 16240 bytes
SHA-256: 76456523f25d115e6863c03404d5906993f237cda7f59a5dd77a78a5cda76e48
font_02_sfnt_off0001290a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290A 11280 bytes
SHA-256: f7ffc0573b614887d96f333584fe39e0d3362f76b123aa36343535ef3a8ef8d0