Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa9509d293094d9…

MALICIOUS

PDF

106.3 KB Created: 2021-09-01 13:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3897bbec8b68f66e44cfc4fe7248d3f4 SHA-1: c47b88660f53ff536d2feaace0c2b8107bd87ce4 SHA-256: eaa9509d293094d932b2f76f3732b60d9a0346675ad78aeb12c3ae137641c83a
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns indicate a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c787c90de3---20070665002.pdf In PDF document text
    • http://sosnovgeo.ru/userfiles/file/27059557166.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/84871866134.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73eefd8394---podidoti.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/34a81ae0627b9539e65abeea5e48408c/11152666586.pdfIn PDF document text
    • http://ping-property.com/user_img/files/sopipujiwodajubu.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/saforupavedegivegera.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1b2254116---dedugesawufi.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709d164e1de---lupusezabelusirigezep.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/87596386586.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/wupoluzoziwimamiw.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/jigufuru.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608036ef9ec0f---2137394089.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98694372606.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/r0ddp13f303oafv4sdk7q1asrt/faxawoju.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160985c8466b88---70410737926.pdfIn PDF document text
    • https://midasspa.com/ckfinder/userfiles/files/26850527202.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/zubebenowobilamokawi.pdfIn PDF document text
    • https://penal-garazh.ru/files/14524437592.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160da671411573---10954864339.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/gofedugep.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e48f50deb7---tepozuzefotusajewavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=parable+of+the+sinful+womanPDF 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_off000137b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC5 18464 bytes
SHA-256: 82ce6456c7ca55ac69c330a4950c4e9bb0f5f07a9aae5b9b71bd3859975351b0
font_02_sfnt_off00017fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FCE 10808 bytes
SHA-256: a2960eb46d6ae2baccf641ae9f975037b992586ce5abde7d13afa715ab683b08

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