Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f4b462900bb8ca…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 20:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b6a0228f40f21f4aaca591c18d8f1061 SHA-1: bcc51ecc55f0757f9af036e4cbec68703d9772e0 SHA-256: d9f4b462900bb8ca2427b948b8fe1a87cc47f5b4a5d57957969ac713bab93750
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26675360416.pdf In PDF document text
    • https://agri-mal.pl/userfiles/file/33809426542.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/remeno.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/lonomakoweromowerib.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/66615836834.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614192e4a0350---labifejefuvepibi.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/niwudajogupetuw.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/nirakabefewelokekituz.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/lixit.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0343d3481---buravuvufek.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d182e37777---10002924583.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/sowawesosinuwive.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/pubinobugeleponeva.pdfIn PDF document text
    • http://rilta.net/userfiles/files/digaw.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/delopasegisusologek.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/jagelifoluvijumemepibatar.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/lasorujedewukebi.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/seduselezexatamewonoribeg.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/87625106119.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/gonofidimuzobiz.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/35567029815.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/sozagolikanemew.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1675ae7a0---nojogefanajafexavu.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/zefuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=korean+sites+to+download+moviesPDF 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_off0000d725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD725 17120 bytes
SHA-256: e40f820bc1d9e642e34bbbdfbda73ccd0a5a45254b3504ca5fd190aa5831d65a
font_01_sfnt_off0001037e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B95 10552 bytes
SHA-256: 339da0635059ef3fcebf4453f7ec89511708a5312f6852f9747cf8e25690e612

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