Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5332841f545bc5e…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 14:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 24958e709e21f914fee0794a732492b1 SHA-1: cb5a0a1525a1481604171b9dbddf4676733a61ee SHA-256: a5332841f545bc5efe5cfe2a6ce7a818a5b30e14604019c4a4f144e7a6ae1899
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://myblindz.com/fck_user_files/file/74041923979.pdf In PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8da188d480---33762871978.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd644f38f04---wenumewazakasunigiwom.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/86770513184.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/69163352562.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/48897590381.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/63855489537.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/sojelirewosa.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/28540237126.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/52389277594.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609532171ed8f---7968383035.pdfIn PDF document text
    • http://texmet.pl/userimages/file/rewedefo.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/sufimekowanirejo.pdfIn PDF document text
    • http://waltwhitman1964grads.com/clients/6/6c/6c9ae932573016e5ff31759a10dce4b4/File/wupujikimezipubafiwesukis.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/fq8b2pg2p80eh76ndp1u6o1vhf/89786997244.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/simopanetoluja.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b310a57ec93---jozebexeden.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/78697954855.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/6884878608.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/82115266501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=introduction+to+magnetism+and+magnetic+materials+jiles+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_off0000d750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD750 18520 bytes
SHA-256: 7c66f15857b661e73868e2c8ffd1cf139231377509254abf0fe80360123d3569
font_01_sfnt_off000106f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F6 11144 bytes
SHA-256: 7063570e45df32d289caef43fdb1cf42268f3152a40dbfdba605178874988089
font_02_sfnt_off000120bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1