Malicious PDF — malware analysis report

Static analysis result for SHA-256 95063538387e1a42…

MALICIOUS

PDF

81.6 KB Created: 2021-09-24 00:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9d9289220f6a5423e4362e701664001c SHA-1: 8d414d960247a4f01a24a55439bf4ec8dda93415 SHA-256: 95063538387e1a423c24d0fe6ffdda9d7ffa6f1fe74c65359b0668bff4a7ba29
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of hosting malicious content on such sites. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may be part of a multi-stage attack, possibly instructing the user to open a password-protected archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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.
  • 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.
  • 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://huntic.ru/uplcv?utm_term=web+service+in+android+studio PDF link annotation
    • http://hockjoohin.com/admin/uploads/file/robuwes.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/josolivirasolifisupaxoxi.pdfIn PDF document text
    • http://egitara.com/upfiles/files/31262165369.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613939c729432---fekimezisebolo.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/82232978873.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/nojeve.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/36422576884.pdfIn PDF document text
    • http://alptw.com/images/files/gerut.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/2675514594.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/diduvawowemosotisovesesi.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/dijewuzagesivulowixekux.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/zevuxotolezibugolunuz.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/57799651166.pdfIn PDF document text
    • http://xtra360.net/campannas/file/50463594794.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/35213041918.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/54665402986.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614045dd89ea5---83394947514.pdfIn PDF document text
    • http://groupkaishan.com/d/files/pajizexajabexipid.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/75216537298.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/24992068161.pdfIn PDF document text
    • http://moristas.com/userfiles/files/67561696314.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/zibow.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/7e22c8e529d0b9ccccdcd101ba12cfb2.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/wixugaxun.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134bef53abc1---kabituwegat.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/firokeroneduri.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_off0000d8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EE 10616 bytes
SHA-256: 3583e6646043efdcadbf2f7da689f0a70b563459c3ace41c8150754e40792166
font_02_sfnt_off00010964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10964 17884 bytes
SHA-256: 0dff37b777125cae2a72d3144f1e25f51a178dc247a3f6f81204d42fe3526b78

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