Malicious PDF — malware analysis report

Static analysis result for SHA-256 938179ec63114ac0…

MALICIOUS

PDF

75.1 KB Created: 2021-07-26 16:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: caa1f157707b522218c1b3e7265efe69 SHA-1: d3e65fbc8db2c030257f8d5f4dff40e8c5b4d5ab SHA-256: 938179ec63114ac0d2c589aa101fe4dda0bede3483dfcd6a4bb298a62d82f4a2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised websites, likely to host further malicious content or phishing pages. The presence of multiple distinct hosts and the use of compromised CMS upload storage suggest a coordinated effort to distribute malicious payloads or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e165add24---xafulirebexomufivuj.pdf In PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fbb9ff1a89e---27731208936.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/munerujibogomofivitizaw.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/29152102406.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/5fbf966499252a88794068600dba283a/gapotoxepadisegudif.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/7219263130.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/gezos.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/78007907971.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/f039e6d8c0d1483c54a9e535769bdc38/bokevixiwojepidaj.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/vilokod.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/84904516.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01b411bb21---kizutirasatowesisigepa.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/36550783314.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/676420049eceb1f1c1c5519437f8bc5b/92927497418.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/979992510.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160821e226b514---10843061087.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f3c19886fbc154001a2ccc6b3d2a8e7d/zikefejomakezup.pdfIn PDF document text
    • https://airbays.com/userfiles/file/97060593270.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8adcbd58fb11a53a280547c9b1766fa6/komebesatufelawakibolafe.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/489lilu32tjkn4kjsi3i3rsto1/nibozuxekaja.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/xujujuzubototitiwab.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/346a0c18b4879d44e9db2460605d63c0/56374310785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=solving+trigonometric+equations+worksheet+kutaPDF 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_off0000be4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4B 16884 bytes
SHA-256: e7b7b7c4c2306cc6b47cc3e3f821bb99817bfba8c42a90c23160459c48fb389e
font_01_sfnt_off0000ea50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA50 11240 bytes
SHA-256: d29c3e5db4e73d459b831b47be80b1813d7c06509e4aa10eddaae653ef0f64d8
font_02_sfnt_off00010439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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