Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd59d6937d2a8ce9…

MALICIOUS

PDF

85.9 KB Created: 2021-06-29 23:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e843049d445283315587edbc7d3cec1 SHA-1: ce422588775b241faed3d274942bb509965c45f9 SHA-256: cd59d6937d2a8ce9776707439db8b53404bf3e59233c54a0739d1073f5abdfa2
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other potentially disposable hosting sites. This suggests an attempt to lure users to malicious destinations, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://a-swiss.com/upload/userfiles/file/38632968354.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/73587c32fa5121e2048627e72cd4d094/ramafidodusudajixizivi.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/5afc200b10922e0cfa0cdd53209b1e09/56940879978.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/1fc5c1f3b748dbd931b03718a84dc7ec/xurokepalojilogefixedefi.pdf
    • http://bpabv.nl/uploadfiles/file/15199031269.pdf
    • https://damiel.eu/userfiles/file/3866320317.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/54494fe507d200891df27719cf75fb2e/betavupisinutipedome.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a8bcec26d---jerijox.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160712f7f375a0---43751285657.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160984be61ae61---kigewujevilixotazubazu.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/30f44fd0d86c41acb1f3277f7d71c473/sakejomikoji.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/3676543912e194391f6aad9da3fc3d78/66931854491.pdf
    • http://benhvienlaptop.biz/userfiles/file/5420842275.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/871e764ea61ef7b680036dbfd10308dc/wemapatezofiposakikiwiba.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f45a9e396---17023152419.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/23e0d0c9808f5cd5d960d05dfbe23b01/108721619.pdf
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wupudofidituvosukimupixen.pdf
    • https://airshow-bg.com/file/68993246738.pdf
    • http://baigeleather.com/userfiles/file/17349116446.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b60f495f7c---56999672453.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca3636f6f0---xubefetuzutapo.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/67267f99b8005e185f58adab0799880b/61016722605.pdf
    • http://agriturismocorteerbatici.it/userfiles/files/revobadejimez.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=resources+which+are+non+renewable+but+can+be+recycled+are+called
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea43.bin
b7820933d96a589583aa78b6f813908278bbd0c385365450c3c13a71d626b69e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 17632 bytes
font_01_sfnt_off00011839.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11839 16792 bytes
font_02_sfnt_off00013050.bin
67e1df098c50242c3d3d1ccb0120f803e8557331db19bc77328bbf2b5c6bc357
pdf-font-stream PDF embedded font (sfnt) at offset 0x13050 10952 bytes