Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a46f0f308a72c63…

MALICIOUS

PDF

92.7 KB Created: 2021-09-02 13:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0b521d3a59482bd3c2df7ab125191bc6 SHA-1: 77bb1b254e6fb5e4a260463c5bfd5f2bd04d6ccb SHA-256: 0a46f0f308a72c63ff35cceeeee735b6f1a54ea43bf2163da64669bc145eb19d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://zakuskymoser.cz/www/ckfinder/userfiles/files/94878444917.pdf In PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/ed35bf51e1ac7348cff32052161ded7f/91146484230.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/262f17f61d8aa633692ebc89cfe6069e/87255637490.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/adfb323f3119518d97f32ba0f62307ad/lamubejibovesos.pdfIn PDF document text
    • https://www.dars.bg/ckfinder/userfiles/files/ladinadir.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/51280678950.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/wigiz.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbe4117f25---4645838869.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/moreg.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755087de424---87986025334.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073796f37052---70622383315.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a707a2251ee---wuxazupaginudixubuveg.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb92f13bcdb---powurejobofed.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/7023e6518b76449737751b5aad12a7b8/6776554505.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/332b5f4c1ecba884463cf7e4d4f84740/mubajokuvezogunedor.pdfIn PDF document text
    • http://armanetti.com/images/42123609633.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/30977161684.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/57718204314.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fd7d4f9e550---bokizilubajutelulebubesaw.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/99601086018.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915337ed933---nimer.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/60993574478.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/jakupi.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/cf1a19653d5b51587beeaf435baab252/sibav.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/47291416508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=listening+comprehension+worksheets+grade+7PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE75 19772 bytes
SHA-256: b387641f6060b85c9e654bbc952bdc20644a2aa65b8d794026eb411c8108ab01
font_01_sfnt_off0001317f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317F 11100 bytes
SHA-256: 322abb0888a1af263e80c38041ffe31aa08a0885c7886d4450c37151dd228cd0
font_02_sfnt_off00014b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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