Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ef350aaff4faa4…

MALICIOUS

PDF

83.1 KB Created: 2021-08-31 18:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1acbb2aa2c4b9a738bff6dae90dd150a SHA-1: 10c90384ae587ce8645d5863358d5cbd3b1ac260 SHA-256: e9ef350aaff4faa4ce6044600bba1455b86b6c179c6367ba0bdb2e9c25b74dd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://fotobolfestmeny.hu/mvc/userfiles/file/73161176571.pdf In PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608127369356b---33353823064.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/60945545875.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/31960498732.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/84979714475.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/vizuwapapeluzi.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/dekotedetupuwimakumiwili.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/wodepiji.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a84afc7f643---gipikojatofi.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/fpd570deqhcb4nhkq183qsqai4/19233517060.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/87aad64a4840c9a6823db56b04c3e840/7964005952.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844cc2d6e1e---gagozo.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/17922729651.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c74102561db---52875326176.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160819078256d1---fiwujobopepipo.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/gcr6kvi5kd93nscsaeu46d45rd/1234018414.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/m24ln6lk75vioqq8c2dbhde8g5/luxuxezajiwefezal.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/penodakobumiv.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/69782113787.pdfIn PDF document text
    • http://mmt24.ru/files/file/nipelerojunalinej.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/0966693041cf088bc24cdc295926fa7d/mazawalumilifofupelo.pdfIn PDF document text
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/75452369718.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8fdb7b876---kiwolimim.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/2b5a0c711e74cdf23f4d5d2b2db02341/67228799225.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ad4228b91---49992194932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mom+giving+milk+to+baby+and+husbandPDF 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_off0000e1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 10968 bytes
SHA-256: 766b13255de55c6fd9c4ee46a758dd16a80edff3531cc5e32fd392f14e1431dc
font_01_sfnt_off0000fac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC5 16764 bytes
SHA-256: afef9f868f13e26143816c211fbcb1e83f34f1ee1af509c991f634d3f53a0bd3
font_02_sfnt_off0001258c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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