Malicious PDF — malware analysis report

Static analysis result for SHA-256 a082ef09a6db2ef4…

MALICIOUS

PDF

78.9 KB Created: 2021-07-03 19:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f634ec880e06587d1006db71c7c03b1 SHA-1: d009b89d4b0ef20f864dcfa3a7bf9e5e208f19dc SHA-256: a082ef09a6db2ef476bfc6f6c7c6c4d2202dd4a7e31bc86c7a86d7e3a179b16e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or contains malicious content. The numerous embedded URLs point to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary purpose appears to be directing users to these external resources, which could host phishing pages or further malware.

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://bahtiyardishekimi.com/fckfiles/file/wurel.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e43629f144---zovakesekux.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcae70405c---fineg.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/37cca4e718656098b7102a18162f968c/23885168684.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7kjrfte8tgr4itqatti9a1f1bc/xubireguk.pdf
    • http://kanstm.com/ckupload/files/lilef.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848e5fd3fdd---21422903192.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/l6c5s3r15lcfpha89vq74eb8s0/18848832608.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c3506d0dd72---winanupedefamevukalug.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16217150209605.pdf
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/tikabutivisemuma.pdf
    • http://93564497.com/userfiles/3832399741.pdf
    • http://brilspa.ro/userfiles/file///zadujarofigugepatupora.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd1124c6a---vipejevewibav.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a978f6d63c9---pamuzidivonawusomi.pdf
    • https://escaletravel.com/userfiles/files/mogifidula.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094936c404db---54761751969.pdf
    • https://bepxuyenviet.com/upload/files/siwexojodanuvawidovis.pdf
    • https://communeouchamps.fr/userfiles/file/nitefibiwikigedejelaxus.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/dceb2f3b9a3590fec7ae6dd2b5f49408/83466815528.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/39e30e3b1eccc758a738ae7a01d35de9/86233380606.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bbd9cbd429f621fe7001ef15dab0cc3c/bazusaxugaxibowebip.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4cc8abcaa---razovuxodig.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607b222e0fef5---tevimiriporegefeg.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=make+to+stock+meaning
    • 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_off0000d458.bin
5f88f52b24825853c37be47a236e699f130b095a3bbe1fb572c1e827d219ea55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD458 16728 bytes
font_01_sfnt_off0000ff71.bin
fb7ded2dea87e6d679f482812b8e44615f12022ed2e3b194d3542bf5b5ae0222		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF71 10512 bytes
font_02_sfnt_off0001176c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1176C 16792 bytes

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