Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fe3c74fda5cdf2…

MALICIOUS

PDF

83.8 KB Created: 2021-07-07 00:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 6cc71c0d82063b40d582ffe7d2e68a87 SHA-1: 36f2af6d7622223ed932720d079f3c21a1a1c58b SHA-256: 10fe3c74fda5cdf20cd45fb14e7e2c093d05c220d101c2cb68913b89853eca8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to distribute 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://inwebjor.ru/uplcv?utm_term=flat+roofing+services PDF link annotation
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/928cf403974c25cd7faf54374286481a/54877738313.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/fuzetuwiruriwu.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/bopepure.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608882c10e9d7---24580861948.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e863bce0e---nimamifebu.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/xilomapedasefanusubaniser.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baff2961ca0---voniralerozabijulakejo.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-19/20210519033612918486.pdfIn PDF document text
    • https://cubic.is/userfiles/file/67308464953.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/lenojo.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/xipewobatojujeripanagiki.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd7b664c65---marevebolekogov.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4d7a10741---91165685530.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078d4889a527---34649400390.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6100ce303b---zujakefuruve.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/kejuwixuzinadutar.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/xozobupakovarudutaxufumor.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5480811d18d1d9f60d503b598eea49a5/jurirafisifogewuzofu.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083636da8649---nujatodefewudivoxetaxo.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/93967522728.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/30928325756.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/vosopapibegu.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/dagosegezigefik.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_off0000e4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B5 17264 bytes
SHA-256: 193a3a8ee3bdc231f11a3336bc17d03cfb3ea5b8a095a2a088df42ec2f6124f3
font_01_sfnt_off000111db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DB 10556 bytes
SHA-256: e4efba7f32a1e254943443c04933a8976441f24e030c0f866f7b0a230b4b4f3a
font_02_sfnt_off00012a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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