Malicious PDF — malware analysis report

Static analysis result for SHA-256 eea121db9614080d…

MALICIOUS

PDF

72.8 KB Created: 2021-09-11 10:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 843ed62a34f9e1ecd384223fe6f610d8 SHA-1: 35b5c9864504adbf0d0f5c7d9a1ae2fb832e58e8 SHA-256: eea121db9614080d0be153ee58dbce4220bd1702dfda7b3030659f73970bc67d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, several of which appear to be compromised CMS uploads. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://condominiobrisasdelnorte.com/userfiles/file/21622029479.pdf In PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd4e89896a---vogumesujap.pdfIn PDF document text
    • http://showpelec.com/data/file/20210906_183659_897.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/selosawoselo.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/2147858587.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/90583038787.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/nebiveraduxevegekugagi.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/57520445987.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/vaxikorokukevaj.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161328ef38a53d---87328827298.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/9931518288.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/siveferukako.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/bexegusubisexutuwopubutal.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/vimamebudesunudaxopuvubog.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/ziwegabonazoxote.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/81287175747.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/jirexobumozujifarajujeru.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8d395c340---10784859308.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/jisodevugipasa.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/81512626197.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/3886666755.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16136f44432dbc---27687490432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=instagram+new+update+download+apkPDF 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_off0000b96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96B 10872 bytes
SHA-256: eeb0a4336bf1e4e17a2d2eb30ec946eaa5416e524e835429b349af5e5b09f171
font_01_sfnt_off0000d264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA76 16768 bytes
SHA-256: 30a04dd003edb3de90f070dc4a7fc4d032735cfdc717d982bf80ba836c6c45f8