Malicious PDF — malware analysis report

Static analysis result for SHA-256 641b5084f21bcf55…

MALICIOUS

PDF

87.3 KB Created: 2021-06-29 01:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e11ff76e90867bbe6e3d75a19d23e55 SHA-1: 85f45c4a2f6bd2fbe35d10cb53f9f4b8f4d0d2a7 SHA-256: 641b5084f21bcf55a4565b5554ab4835eb50c33104746e7eb8516569b2c79d77
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b11f9b61f79---25701445423.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c210b015859---38661420479.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/9527aabf006a135e0f3b2a58020f6e55/25933958199.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f87ed282e---guvajov.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0d3f6cb97---26521410366.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/cce9047458bf4c337cb8b669f7660309/nowebamexadobenifok.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/42881316525.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/209c31d7b4145f7f5f6582d4864afa98/givozumigawepudemomefe.pdf
    • http://libron.pl/fckupload/assets/file/texasalozipebojunegu.pdf
    • http://abwlanham.com/uploads/files/50171103708.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d199894f72---katonuden.pdf
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/texum.pdf
    • http://velocimapper.com//webfiles/file/gavixigokajologiloxa.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da490acc574---9863936537.pdf
    • http://solarhomepage.ch/fckeditor/editor/images/file/xilub.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/50bbccda503e1693b0c650120658c21a/39324866546.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be6d7abda72---defozavuwifajifiwupa.pdf
    • http://imhyuk.com/imhyukeditor/userfile/file/15223871672.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb5beb2ff7---jofitelapaxim.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89b1f8cbbe---mufedisimufaradi.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4e0851c69---fetebasedijilorawajaluk.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/9bcf71efde3e51b2a627392397cb7b80/61378014333.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16084dd143a9ce---maverijoniwozajumonasazad.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=spiral+and+multislice+computed+tomography+of+the+body+pdf
    • https://doi.org/10.1148/radiol
    • 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_off0000efa4.bin
8703f6199ccda34531a9dd69c2743ef5bfac9d17e6b85283b49115929bd1edbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA4 11496 bytes
font_01_sfnt_off00010a36.bin
d85f1e9f830235c156b20df310b83d1bc4e7e77c7a839d5869d47802009aa305		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A36 17496 bytes
font_02_sfnt_off00013791.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13791 16792 bytes

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