Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81419cf027feb58…

MALICIOUS

PDF

68.9 KB Created: 2021-10-03 02:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c361793a319b9130cd82a32d598c2d0b SHA-1: 34cc82269bd1c7de96cf2453494cc5be9e640c53 SHA-256: e81419cf027feb58a9f2acd982ca72d53bb97937160ec44fb5995f870e12714a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to potentially compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=my+condolences+may+he+rest+in+peace PDF link annotation
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/531dbb997a36b2818f1539ca3b63f98b/nakuvipopuvexolam.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/0789b241d25e423b0a6eee9e2f466ae5/63108199007.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/molamaji.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613048e273885---88889914371.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/xuzitid.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/jorutorewupakalolunevofa.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/bisobuverinu.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/mobifaf.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/towenetep.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109052257251315.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/99261489672.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/vobikolololisavasipi.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/jidara.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16152fc135cef7---rikodugunodefegupoza.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/bemorovelikobazabedataxi.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145429d4c03a---79110063734.pdfIn PDF document text
    • https://virker-ikke.dk/files/temedazika.pdfIn PDF document text
    • http://clingac.es/d/files/23963711504.pdfIn PDF document text
    • https://paintingwithapassion.com/nbloom/fckuploads/file/30394159389.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/68372833351.pdfIn PDF document text
    • https://baptistfriends.org/media/rirevapozixusip.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210903160451577.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/35779951309.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_off0000af2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73C 15136 bytes
SHA-256: 71e505c278e0d5eae1b9bb474c410661cf4b144d2918e9dfcb59d3cd8eca2457
font_02_sfnt_off0000ed4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 10888 bytes
SHA-256: 949b9bd939b108fe5042d892a04a1a19b61e260302adc251e3fb95956f51cb1e

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