Malicious PDF — malware analysis report

Static analysis result for SHA-256 e393009d085129d0…

MALICIOUS

PDF

99.8 KB Created: 2021-07-05 19:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4e5b8a0e2d6f5008e94cb5af0e155ab8 SHA-1: 173640e9dd461bb29c08825f1a268265b52b0a07 SHA-256: e393009d085129d02b8ff8e50cf3ddcbd6135fe3a4b3e3e19c1678dffe81b856
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing pages or download further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

Heuristics 6

  • 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.
  • 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://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f07d8713df---36926602645.pdf In PDF document text
    • http://absolutelyneon.com/userfiles/file/53855301541.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/gekoxinomepug.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/4lqdivsqvbmk8mi8mvt54qq9n7/89238763926.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c239bab78c1---70502906753.pdfIn PDF document text
    • http://vieclamketoan365.com/upload/files/87744939751.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/98442539644.pdfIn PDF document text
    • https://terrach.ch/file/jugupalone.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/17961550268.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a55330cde---99463264520.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/losiwuwopabemusima.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/e5f65cf7629ddcf270890bd5edd1b6a0/93082827570.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/foparipipebaro.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/ripugosekosir.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/c9ab0bdc1f0d011d2053fcd03ec3d5e7/nelujufelatemisif.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/timogavibo.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/9865c45c8a65b1d0d1bc74d9291d386a/gigirijedi.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/436540b4db2f3c61c5ace2e78e6c8e52/xukajivisiramoromenutufu.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749318da87c---61534886692.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///50277086963.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/5f1443a9751a48e0895a6ce8a44be290/sapopujiladegidolova.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/17384132163.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c97be87549d---50383192849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+build+a+auto+smelter+in+minecraftPDF 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_off00010aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAF 10952 bytes
SHA-256: c24fe9990da32ecd4cf32d38e9a62730ebdae1ba6f7c7c5f626973857f0cfc70
font_01_sfnt_off00012414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12414 18236 bytes
SHA-256: f38bee273d79bb843a1c9c5d19b89bccb01950ffc4704a6eb433f56211c12972
font_02_sfnt_off0001540a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1540A 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off0001694f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1694F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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