Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd8ad85c125e2a0…

MALICIOUS

PDF

71.2 KB Created: 2021-09-25 06:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce642d20fd4510464d4f2c1091a1c873 SHA-1: 11562d31dee3e6797133aeae5e9bf3e8b6115f7c SHA-256: 8dd8ad85c125e2a05a56126931f8a6fc6113e4ba68fa7424b5f5aacd634a54a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://pixomot.ru/uplcv?utm_term=play+store+download+free+for+laptop PDF link annotation
    • https://terracetemayonetim.com/upload/ckfinder/files/99663670360.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/bafifizanuxekoz.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/guxenun.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/2ehm81o9gfhsa49do3861fr0ml/sekuzefebekopefonulipazo.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/zovevojadewoxezijoxikazif.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/92904984466.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sizezaniwevafaraposowo.pdfIn PDF document text
    • https://gornjastubica.hr/files/26099977575.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/jejorusaxet.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/74624362097.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381e8a71f72---xobixekoxagiguku.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/katuriziwugupi.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/vakipeb.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/51684293215.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e89d455e28---zimuwivikox.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/7593560829.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/25320786689.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/27167807462.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/69651b93148a211dbbeebdc5fe1b4d04/nevagukagi.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/77931239072.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/xeximekutejonuperisokovef.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/86718665140.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/jetusijobisududo.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/revisupasalijukenumur.pdfIn PDF document text
    • 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_off0000b1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FB 10600 bytes
SHA-256: e06f71198f6fc71feb42aa709c449ee60e37ae3fc8ddfeb06674cba4be5df7f4
font_01_sfnt_off0000ca79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA79 17316 bytes
SHA-256: 65a33d6ccc649bc36b6fb14c9744b0bd6f663cbda86db44a8b2437038f8dbab5
font_02_sfnt_off0000f741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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