Malicious PDF — malware analysis report

Static analysis result for SHA-256 e336122cb542e960…

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 22:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a104512b26123e09e88bc9726a2a55ed SHA-1: e7471e77c9496f8924dd6cf4f5a4716f6dbd04bb SHA-256: e336122cb542e960c0728f57480de1da2af06bd016beee36259d4ede800e0252
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress upload storage and disposable hosting. The presence of a 'download' button lure and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a payload. The ClamAV detection further confirms its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://ags-car.com/upload/files/nugikogunajurip.pdf In PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/tuxina.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/zumabuwaboki.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/29278217706.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/tejitoxesoxivafizonanu.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/89955035874.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/77861535100.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109052224063644.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135492adf49a---13209521226.pdfIn PDF document text
    • https://bataretak.com/img/files/file/xekijiwom.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d657b773ef---buxogukupu.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/60771069113.pdfIn PDF document text
    • http://deltools.com/userfiles/file/56090378072.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161319522449f9---tisadituxupuxupuzo.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/xiwefebopupaxujunos.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/zezigu.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/tejuwiwamiz.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/50990254011.pdfIn PDF document text
    • http://change4best.ru/upload/file/83184960232.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/tetotamoxadofu.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/30005819170bfd3c34e4257eb21d2333/71636489455.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/votafiwegamo.pdfIn PDF document text
    • http://strandedtattoo.info/file/zamabozumodelaravasid.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/87084240440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=download+free+pubg+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_off0000deb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 18220 bytes
SHA-256: 6b6376418ec9c18115b672bf6b27043b32c2310cad2d8794ea7923d98ed50e6d
font_01_sfnt_off00010dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EA 10732 bytes
SHA-256: f6ee74de8a69a05882b5a5496e9956446105d0574d11fed28d95dc451ca79de4

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