Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb4c1332ee5fac1…

MALICIOUS

PDF

84.3 KB Created: 2021-07-13 13:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 53dbd49da2f4f3ed9f317ee99e5d72f1 SHA-1: a911c093f220fce746f8db5c4c23230f41ee8a60 SHA-256: 6cb4c1332ee5fac1dc6db2dbaf13560558786bec597b4ce029865cc8fdabcebd
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to manipulate search engine results or redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple distinct hosts hosting PDF files further supports this. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/068je37mda8b85hq5vqmpqf1nk/7764408018.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a704ae9c868---sikusiwit.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e559e97bd---mupapexuxazipives.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/95442800929.pdfIn PDF document text
    • http://hookmyweddingup.net/clients/73542/File/womaramo.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/5a938f085266c016016440fb3ce1ead6/sivobowefujipetaratamefop.pdfIn PDF document text
    • http://thaide.org/userfiles/file/10848027407.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/88609152023.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db84d98668---26370723290.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/72192937109.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/68a1c75f5e4fdf7bcf6c28bd05806ea9/gunozapemijowexoveliduru.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d905bb9b978---wuwupanidof.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/0d80b790b2da284b782b26743089307e/76726902560.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/62115031858.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/ditototamevopozew.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/lorizupusasikarodopiki.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/841347c722ad3508ddeb0cc0ce6cd5d5/gazuxiroxuma.pdfIn PDF document text
    • https://efnnma.org/files/file/43054561425.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/85331306342.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/2d9rkibi65mus1bjp1p0kloe9e/21807567865.pdfIn PDF document text
    • http://ndt-ultratech.com/files/voxuxazon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=dementia+forgetting+someone+has+diedPDF 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_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 16772 bytes
SHA-256: 9e4de0225f56b99a52467eac9816ffce59a6dc7b3a02aa2f896f6acb0c05cfe2
font_01_sfnt_off0001137a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137A 10756 bytes
SHA-256: fc8655aa74a287876fd5320893f0f68a7b2caa5f55b5ec2d89adf376d4d21c2e
font_02_sfnt_off00012bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1