Malicious PDF — malware analysis report

Static analysis result for SHA-256 5618bbc5b908c2b6…

MALICIOUS

PDF

102.9 KB Created: 2021-06-26 01:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebd0e1caa03184d09e9ec7df5cbfdbfb SHA-1: 93f545bcc25f2bf0be9c153507b533b9dfd07dbd SHA-256: 5618bbc5b908c2b6b8fa8b74e43439deb9471347a9cdb96644c2d3a688713deb
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content. The PDF structure and link farm behavior are consistent with phishing lures designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/adc291cbaf713d751bc5105d2f9296dc/22002107565.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/q5sm11ab9287iaohih6473o7qp/44471312861.pdf
    • http://chronicles.ae/userfiles/files/46385277445.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/4d2f3168d832a2fcb7b3fed755d04a56/lokik.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/027273338f226db866fc538ae18fb4d4/felezexomuxezikufanamuruf.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d41a1cdee0---8078772420.pdf
    • http://yngc.ru/admin/ckfinder/userfiles/files/wevone.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f19506ba48---bixowagegukiripoduwixi.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/lc007718indttkns3brprff5bg/99845481292.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c86959d6586---67202709903.pdf
    • http://flynewsletter.com/uploads/file/nexowamosixoforivupotut.pdf
    • http://zabradli-znerezu.cz/userfiles/file/nedipozonazosigiziwedi.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/f8845f095351468c675130255a0772b7/90476413654.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b547b9d2c8a---midusagatulejijes.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2caf99f07---67650651999.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749a700a1f9---fejemuwezikebetazidifa.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085ca57291ff---3853429222.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe744bd52b---xaxopidubukekibi.pdf
    • http://alarmy-kamery24.pl/userfiles/file/rafaxemukej.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/5bc3b7279031580ab70c1dfc42d4c95b/zuvawoxilorenifepudig.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24fccaa8eb---xazupomolorojuguja.pdf
    • http://foodchemsino.com/d/files/kuvikenugamusit.pdf
    • http://tribo.kz/userfiles/File/penifalazawopevanalizeloz.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071aba865dba---48784962975.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/qb7ok8rnloug5v93dik1rab706/pezutekubizefotewus.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=types+of+aerobic+respiration
    • 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_off00012b5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5B 16792 bytes
font_01_sfnt_off00014372.bin
3b61d189484181204b71dbb370c604b0143bdbe4927940f58d290f62d3e4b9de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14372 10644 bytes
font_02_sfnt_off00015bcb.bin
e4b991c070a8a03a10f4230089a9e6aacba9863c68791e375b89eb71bc22b1dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15BCB 18348 bytes

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