Malicious PDF — malware analysis report

Static analysis result for SHA-256 66389669d139994e…

MALICIOUS

PDF

80.1 KB Created: 2021-09-14 00:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd6aac91793f803236738e04527133e7 SHA-1: d4608542058a7c3747918143ff487fd413bbe39d SHA-256: 66389669d139994ece43ec36c40afac3e5f89eb17e9f279e399dfd29de94274c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to redirect users to malicious sites. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://campbellelectronics.com/uploads/6426588147.pdf In PDF document text
    • http://nissanotogovap.com/uploads/images/files/nejerexasiguri.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/lojak.pdfIn PDF document text
    • https://maviet.vn/upload/files/napel.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/dinagetipifosesupoxirivit.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dobuwezilovivowebesasir.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/nagefosijulixetudodagumus.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135f24841a37---38532368317.pdfIn PDF document text
    • http://goref.ru/files/file/99106881112.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/2121b4840f8d2b8bc2d3603baff42557/febebo.pdfIn PDF document text
    • https://cowik.pl/upload/dawolupisesutevadeda.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/fagibujisiraban.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4726187473.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/difibuluxowarimidatojov.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/lifefalezaxatolumuf.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60117525119.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/32813817110.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/95575265580.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/bajimeg.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613902a5b3f13---mugima.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/dosomumu.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109072252253463.pdfIn PDF document text
    • http://vpsystem.com/files/fck/36032691165.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/wiwoxeruzolerusenoguzavu.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/5886154308.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeea39e47c---gunijuwupigikevofipifisat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+long+is+chicken+good+frozenPDF 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_off0000d448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 17744 bytes
SHA-256: d33ea3ca0192dc82f1f070d79bac7359f17d85f1ee9cb6ee73df9d795096b038
font_02_sfnt_off000119f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F6 10724 bytes
SHA-256: 0dc5ce33e51a420e2ce6fa04317889bfbb8e4552f1af5d4389011c1b74a7efce

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