Malicious PDF — malware analysis report

Static analysis result for SHA-256 96f695b09f6f1fa9…

MALICIOUS

PDF

92.3 KB Created: 2021-08-16 13:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 75fa542e63354215f53c941afbb22173 SHA-1: 7f7b0f163c27b8c2f549a4b1709a4a64dd6e2f8d SHA-256: 96f695b09f6f1fa9eec52de413a2e0199e7626d7baa6f6f918f9caf51518bfb8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm for SEO poisoning or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the PDF might be part of a multi-stage attack where the user is instructed to decrypt a password-protected archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://coretry.ru/uplcv?utm_term=potter+perry+fundamentos+de+enfermagem+9+edi%C3%A7%C3%A3o+pdf+download PDF link annotation
    • http://cafesezony.ru/fck_editor_files/files/verewetupiwuresaxulalopi.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c05f7724d4---65673202046.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b575de148ee---kixidorobibusitogaxatadaf.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/39458346058.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/tegisuk.pdfIn PDF document text
    • http://ca1970.com/clients/10044/File/nasirelamodit.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/39555090204.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/96176630814.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/60987455894.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/d7b9526b8ed2e1f3b9c581d8cb0c6061/wobobuzamozokagewurufofiw.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a15af3463b5---26487181596.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/zejupawezuziberazever.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1b41388634---lupugakedebudas.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/288701c8fbf670c6b179909e1e3b9b39/xutapowezodabe.pdfIn PDF document text
    • https://protrialse.eu/files/files/92079920331.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/31117049233.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/109bvukongde5fc4mapv3l6hp4/vusugezariwibilok.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/gazukixizubiri.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078834813ce8---nokexemeku.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/73a965c8ab78f6a769b7107db7bbfcdd/xomesurusekedarujemapija.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608630e82d82a---79474437788.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/kowuniriweporiwino.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_off0000f6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEC 21360 bytes
SHA-256: 3f4a55c16cf59b5910b4d4edf88c9ab3fe490fed77e77656650a38c39b952198
font_02_sfnt_off000143c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C0 11772 bytes
SHA-256: 26640d13d7b4efadef5ae83296487080706768a0f72364f1db6136161de1a7bf

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