Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db3753a8fb35cae…

MALICIOUS

PDF

90.0 KB Created: 2021-09-02 19:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2d6d815c56e7157b0e5741ffd2307bb SHA-1: 3e64a2b6327864d32835f16d228a78df8ade6f31 SHA-256: 5db3753a8fb35cae5a8e1e8e29b6d48190c1ab5a0e54ae1506d497130a58f2ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161061ff24f7e5---58616038287.pdf In PDF document text
    • http://playbabydoll.com/userfiles/file/retowepejusob.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c389e5c04---pusutasofesomevog.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/rupituxuv.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9074019a9---posevow.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2c43c7de6---46818379385.pdfIn PDF document text
    • https://superpart.com/files/75510265014.pdfIn PDF document text
    • http://waypl.pl/upload/File/53994295707.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/sipuvomemamupeligusupi.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/viwukisagudiva.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/87504711651.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/jesuzebosogekobivuko.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160762e073d4c1---90415501414.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/36222027197.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210527_F4E6B16D63A8F844.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/5c6rtfqdic8ush8dkutuucueaa/titufepifaroxulakirepiw.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/12457263858.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/24467075088.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/deb8967e503df50d5175e1bd42b2fa64/66756658031.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790e05823dc---wepepi.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/ee318830bf429dcf55de3a53ccf5d1a3/jitafa.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/b27d8906ee271b81146737ac04f266c8/97564860012.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/67233236980.pdfIn PDF document text
    • http://takipcisec.com/calisma2/files/uploads/fisojozugunusopul.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/uhdcu6336d87609v8m0uksldh4/vesamiwubel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=spartito+let+her+go+per+pianoforte+pdfPDF 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_off0000f927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF927 18552 bytes
SHA-256: c64a3bf7cea16338adc1a427a7198e5a97ea398f75b7c5b299b45da905e859a8
font_01_sfnt_off0001298d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A4 10684 bytes
SHA-256: 6148b7efe1c2230ab4404b1cdad625609fd5a8f0c404acca6873f58c3dfb0942

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