Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea032cb61ec5580a…

MALICIOUS

PDF

84.2 KB Created: 2021-09-07 18:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec30bfca3430bf567de56b024c7afa9e SHA-1: e8d941c5edc5c00237bc869ba56806953cbe8c19 SHA-256: ea032cb61ec5580a5f7c47a24edcba6dc5380f619079f138b3c6a35ee8dacb04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and URL analysis point to a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://copy2d.com/ftp/image/file/momovuzipasanuboz.pdf In PDF document text
    • https://digireg.dk/upload/3558381327.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608706c29359e---pidona.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/xawedisudinum.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/8515424548.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/af0817713f877d3db86f459ffac75961/wonezopexu.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e708695ea---32642038683.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/68211927394.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/81012151760.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/tumididijulelajed.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/27353366784.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/22968076100.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a187201e39b---70975222104.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610326761180e---defuvogupikiredafejenu.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/87618747674.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/tamut.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e248bb3f35---rolusanaguvif.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b28deab37---56063254816.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/f34b1fa43725a2dd5f454d11f276e066/kexozogono.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ed5b5c1b7e---vemuxajofegevosu.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210702_C93C0819EABE403C.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611735586a4ae---96768417418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ao+smith+electric+hot+water+heater+manualPDF 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_off0000e3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A3 10660 bytes
SHA-256: eab799506d1c3787507fa61aa1ef5923eaa4ef4514e6f1e0f9f90280ec7e03da
font_01_sfnt_off0000fbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF3 18244 bytes
SHA-256: 6f42760802b7a3ee403313df86c520960304e401f7aa96e1001c9f66795052f2
font_02_sfnt_off00012b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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