Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e2658f930818c9…

MALICIOUS

PDF

93.2 KB Created: 2021-07-08 09:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5bf2624c7be57ae3d9c3c43cefe39c9f SHA-1: fae178724788364c620a53d2d041b0eafd729e1a SHA-256: d7e2658f930818c9c5bff572bd8dfb2c007cd7eaa9f82f81d9f9999d62d57f2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing lures that attempt to download further malicious content. The presence of embedded URLs and the structure of the PDF point towards an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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://nomylo.ru/uplcv?utm_term=navneet+science+and+technology+experiment+book+std+10+pdf+download PDF link annotation
    • https://mytopics.it/uploads/file/90487165037.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/30398698707.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/25564268787.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079a8df2218b---ronebanonigujolazopaso.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/lt6ssd7frijm3bfg7g2oqbmsu2/84713877756.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/223e66923b449f80fe560794402aadf3/11773408520.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/p2u7d8o5c1s7gvjq4qk47nfo67/39493375644.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/15ccab194cdb18606654b33328f6cb23/1132655921.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/99003164652.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/26482612529.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/1245834328.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079e30b0350c---50634001315.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/c83eb32e233d14c95d9f7ce36bbe9711/bunavasemukudo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1aebf3646---taturoxagobi.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/1905b86fe19b693e4a2b47e2567211bf/23855257906.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091aa5a5f699---kusazavozigibapiwujuna.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/vidovoni.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/mulogavenoliza.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7b6416acd---80113146879.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/57608623311.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/96d3f2ed0b273bcb107598b2c082be06/72910126603.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/lukovezufibegadi.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/rusunotadakap.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8c33b14c5---vuvovuzatafamidixati.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-6/file/2021062016270473499.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609210e2abfde---wilexadonorotiwawojab.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1622f91977---vezitexejipodezinamafoxi.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dde5472762e---kevekivanegabejapoke.pdfIn PDF document text
    • 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_off000106cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CF 11816 bytes
SHA-256: 92ec60adbe540c1664032707d8fedb6922d756e79f50340e85fc59c14dd212d7
font_01_sfnt_off00012293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA5 17312 bytes
SHA-256: 2a6ed6341026ce53bc9132e28893ebcc61877807b0b129301179c7e7b56e0e7d

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