Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee66d1b6df395560…

MALICIOUS

PDF

68.6 KB Created: 2021-09-25 08:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2e8b91d1472950d39c160a38c291b0ce SHA-1: d1a34823f6c25b4948e94a0c45920873ba679d64 SHA-256: ee66d1b6df395560ea52097cfc72e26de08bfa08c610089f8429f37535884578
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_IMAGE_LURE' indicates the document likely uses a screenshot as a deceptive visual to encourage clicks on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://designerhouse.ru/upload/files/27442364052.pdf In PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/88231879789.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/bogufatenazudalobewitapo.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161338d3b55eed---58107491453.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/22752262109.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/maxeleboresepetipixozided.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/bitenemodivapu.pdfIn PDF document text
    • http://apcmagon.com/userfiles/9477425217.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/kusimojafizisenarixasakan.pdfIn PDF document text
    • http://gaudi.tw/upload/file/9117992750.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/98632326685.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/92100581802.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/3520395932.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/xubizanifumonizezifeparob.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/fovepubevetagezo.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1632084866.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210912203123.pdfIn PDF document text
    • https://kinhdoanhvaphapluat.com/img-dn/files/tufakekilopokabalorazo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/bj49vtce506473lldlospkc836/nadidudotapevufata.pdfIn PDF document text
    • http://logicamail.it/draft/media/pukulumik.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/75180280871.pdfIn PDF document text
    • http://cafecontinentalmd.com/uploads/files/nofifinigu.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/wiratofofajebodutedun.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/nudiruw.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161484eaf48f75---wavagoselizosilosud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=safe+mode+off+redmi+note+5+proPDF 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_off0000b103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91A 10652 bytes
SHA-256: d067590c0e3db4685af17e913a46601276484cc6ff7363815ec193251970f68c
font_02_sfnt_off0000e179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE179 14244 bytes
SHA-256: 816528488510dfe014edb4f422a56376934a3723d93ce654cd65332ecc769a88