Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c64ac336e82121…

MALICIOUS

PDF

79.0 KB Created: 2021-06-29 17:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad5d71c7476ef4cc331bd8ab71d5abc8 SHA-1: 28cefa7b0f60c31aa0d3398ed4ac392022691700 SHA-256: e1c64ac336e82121d0e200b8b85e772b584a9612a88303fefc9d696d5195070f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress upload directories, suggesting it's designed to lure users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a potential SEO poisoning or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://hotellemaritime.com/hotel/upload/files/luvitezulopo.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abaf83f0ef2---kefarixezolerezipek.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d33fc82403---73715437043.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e808ccc42e---10178892458.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160b354c96465d---19518285663.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/906a0525cd8ccfe1945ba117d7b018bc/jamodetepepawekiso.pdf
    • http://www.contectrade.hu/fckfiles/file/30630006127.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa60fc6322---mamowomi.pdf
    • https://magyar-logyogyasz.hu/fileok/file/30410989852.pdf
    • http://automsystem.com/UploadFile/file/20210524101105027.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609887ecd0d4e---16386423530.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/2861b4885340f8385ecc08e185c16814/pozaxigojux.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/fdd45a4c69a8ddd53535fa8c753d90cd/93796440502.pdf
    • http://firmykominkowe.pl/Obrazki/edytor/file/sixixarenofapibudikegogi.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b567a8493f4---49915249843.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/c4b6ee49898d535c087a6c18a5d07a5a/tawava.pdf
    • https://lamaisonducoeur.ca/upload/editor/file/49410064374.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb3533d0d---93309763814.pdf
    • https://emilline.dk/ckfinder/userfiles/files/25939073673.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cb7e6486e---xatekifapumigola.pdf
    • https://mimpishio2.net/contents//files/jutusowesipizutuvogat.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608450d3a3882---5862698235.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/9c0e4f90b7a207049b10bdc9fd7e18b1/tujozoxumaxuwalel.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+train+your+dragon+4+homecoming
    • 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_off0000cff5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF5 16792 bytes
font_01_sfnt_off0000e80c.bin
3b3c2ac4ab53f5f783664577118449e75dd126e34c43c17970dd15ecdde2eaa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE80C 10972 bytes
font_02_sfnt_off0001012c.bin
b2b3ef255f46ff4c7d725b3e477b96fe9ca060cdae139fa004fb1549fd8eb17e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1012C 17492 bytes

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