Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a481ac065c9807…

MALICIOUS

PDF

85.9 KB Created: 2021-09-03 09:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 49ef4e0f53c09332f455b6891c333fa5 SHA-1: 94cbed99625f348eca39d916bc6e4ddb8c9b56fa SHA-256: e4a481ac065c980765d98e2f3e95050b0eecfc55e74a3b8eb01952ea9f5bf832
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of the document as a link farm on potentially untrustworthy hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://baocaosudanang24h.com/uploads/image/files/24594339161.pdf In PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/3912136371.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c953a335176---77877239856.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/53f0e9c287a6394513a20215da291452/5924995326.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/bc96d6d4492ed971376ee1d64d07625f/70932337116.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/16407463150.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/36965984248.pdfIn PDF document text
    • http://cortabellanews.com/userimages/tupawub.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/jizutujigetova.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/94616552160.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/5391026773.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/16217022340.pdfIn PDF document text
    • http://quaint-house.com/56970143599.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb66d0f762---sewobomonizapipari.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/11ba3f9b0f626cbce5d6d5328feabb82/kiwojivimejigip.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/miqtca90ggk021gjm5tptkjh51/gedofaxivevulip.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/17361439273.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9e14de3e51bfcc2c5df47eb3a74e508d/tazugabewiwonujagizatilo.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/26085061719.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/towotaz.pdfIn PDF document text
    • https://conberraquera.com/aym_image/files/11433829575.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b95ba347f15---gepetogitadana.pdfIn PDF document text
    • http://orem.mn/uploads/files/72653884655.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/befenesumepovegujefomawof.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/2446629104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=logistics+management+meaning+pdfPDF 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_off0000e78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78A 19136 bytes
SHA-256: 08769ff268b4a0543b4d2cf3ef7300a1c1caa57ffa7b619686f4ddbd52ad5de2
font_01_sfnt_off00011997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11997 10776 bytes
SHA-256: a76e7552278b2b25a4eb26830e15d3286face658c3029b59e27cf18742597c08
font_02_sfnt_off00013230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1