Malicious PDF — malware analysis report

Static analysis result for SHA-256 84dbd9909bd1b944…

MALICIOUS

PDF

101.5 KB Created: 2021-07-20 14:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 4842d06acf114b220252e4fb750a24a3 SHA-1: a90e653c99f28c609efac05369e627792f5b6069 SHA-256: 84dbd9909bd1b9446314444ce8bb1336f6178f4e036e4259c8dd1f8d39a91ed5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://alnoorcity.com/userfiles/file/xotukakefotatas.pdf In PDF document text
    • http://billsky.ee/files/file/vodig.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160adcfffaf78e---53188528203.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/a87a080e28bf0f76d079c159d02c273f/xasinotesidanor.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/2995f7301eeb290a4a575dfb7b7315bb/95205392959.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/c785peool6rqaekkgjar2aub57/51246717574.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/fujovov.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/59846300830.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/fokexiv.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/47476959669.pdfIn PDF document text
    • https://togeltop.net/contents//files/53973663044.pdfIn PDF document text
    • https://peterdegendt.be/file/pofisimonureloxikiw.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/63845965547.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ql9v3a5pltgq1plh54u5mneec6/26404499280.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/30614719325.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb96ba3250---bekef.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a321f5af8cc---fugozoraneturexa.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2dc3985b7---66523075160.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2205ed3eb---39410700648.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990124a1e26---xerativibabivojegesoj.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210720_5E5E2EFF6A6D186F.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/p1vahmu4v1t62gjnta9amqtit0/kupakanawerenedixuf.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ef8ce0bf97184ecc8e04f8a087033855/suviwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=positive+word+that+starts+with+cPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C9 17264 bytes
SHA-256: cf8041a3f13d6586d3b0370e69a382493d6fd7a821cc4a3924b1baf859ec205f
font_01_sfnt_off00014106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14106 10468 bytes
SHA-256: 373f80b3dcf49f7823a11a6113bdb39ba2b43aea29dd66a2f2a81598f9ffd9a6
font_02_sfnt_off00015916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17127 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467

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