Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf9787df7a3366e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-11 01:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f3a95457afe78b600a07014c8eb6a74d SHA-1: 08cac523ef6e5eaffb2a8615003918a3b33e8df8 SHA-256: 6cf9787df7a3366e7298eff767e24a18be5d39d43288a0b059e07377efbdc89a
172 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains embedded JavaScript and links to compromised websites, suggesting it's designed to trick users into downloading further malicious content. The presence of a 'download button' heuristic further supports a social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cableesmaltado.com/d/files/jobomapezuz.pdf In PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613361c138353---busuxotilen.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338b4092f59---50601582581.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/et5jju8v0emn99ohca9p8kt8t1/31329058070.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/gozovibunovovugukameji.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/vereliboriboz.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/fuzaluxanofitedere.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/54784914122.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/regunofixojeritanusugaji.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/23126085845.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210902_388E1C015551A361.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/70838260778.pdfIn PDF document text
    • http://soc-in.com/data/media/files/witor.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/71803100157.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/22718528590.pdfIn PDF document text
    • https://angem.fr/userfiles/file/rekadalan.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/60540034290.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/mofazabakojiruzetibudubos.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/97759453087.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/81314371265.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/xozaxewuw.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/bagejejevobibabilikelosa.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/1993731195.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/vawewonon.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/fuxedu.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/38485990241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=gta+san+andreas+download+app+and+filePDF 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_off0000de42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE42 10616 bytes
SHA-256: 893f1e3a54c59015b07e4bf9956dc4a249f41259f3e59d55ca9676b65e47dc8d
font_01_sfnt_off0000f6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 18568 bytes
SHA-256: 768e9bfd9b40bb1ad0f840d961fb8593ed7f487e06767e53d53db99531388309
font_02_sfnt_off0001263f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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