Malicious PDF — malware analysis report

Static analysis result for SHA-256 f94e5562a9f08c05…

MALICIOUS

PDF

58.1 KB Created: 2021-09-08 07:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3b24a623cff133f5fbbb9234adca05fa SHA-1: 58c6a5dcf7f74327cf184dd9a9e925ba225a798a SHA-256: f94e5562a9f08c0506ecd73e442c44684c589d5d3333037d976ff7f13722b399
94 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites, many of which appear to be compromised WordPress installations used for hosting files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to manipulate search engine rankings or distribute malicious content. The ML classifier also flagged this PDF as malicious, increasing confidence in its harmful nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6508

Heuristics 4

  • 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
  • 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://pixomot.ru/uplcv?utm_term=tamilnadu+sub+inspector+syllabus+in+tamil+pdf PDF link annotation
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c1f90df97---lafasevof.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/lebalonetotelikawonene.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/81503833760.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/sijejifipojuvu.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/gn295744t4iv23cud3pcvqmsa9/70207655446.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/22335356448.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/kijonofedezamuzofodefipe.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/gupifipepilikepam.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c127a1e5b62---galamizomurimefekup.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/mt91babkh12jlmbvh176s3h7h1/13334611031.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c6492c3a---rofomilos.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/kubanafovelisiv.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/jbeagmfqarvu4lj9bolr8066c1/xigumukaj.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a354e9b81a5---64185357776.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/9576352664.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e50acede2---2715881330.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7e72bf6d5---xedowibilenovegurobalawer.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/ramekeseviwutejifos.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4636035faf---sefimev.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/1477c4facfa747dc9452f661bd8f565f/15818871995.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160925b9239a12---kotaju.pdfIn PDF document text
    • http://ceroki.com/image/files/videlopokoxomobes.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/kelipuvofaxije.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/pezefiwikaxapatakamekij.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE5 11100 bytes
SHA-256: 674954b1f79d46e383304668d7b02b8d3114a612c729b49540a735fda2ea2b96