Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f90ae86c8beee75…

MALICIOUS

PDF

122.4 KB Created: 2021-06-26 20:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6e95963a0aac89999dd2610f2ef5ba7b SHA-1: 817242d6785c70e0bf686202fa80eded2915ba20 SHA-256: 3f90ae86c8beee75db31bb2b1961df77b60eaa20b2bd7e2c2c7a4659f6159977
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS upload storage. This suggests the document's primary purpose is to redirect users to potentially malicious websites, likely for phishing or malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078898dbf402---27121713930.pdf In PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/7b5d6fe14e3411e42e42e2a4e5b3e165/bujemugam.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/9413747017.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/c1da9ae91ebebb41679f5ffc0764c1b9/vutimelojijopebilub.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/45034863574.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/41094266818.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/suxuvuzulemeku.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afa000568c---jabifuni.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/54786271804.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/70005584690.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b1195da61---81855735108.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb1f064618---josuvufapusiranimodesap.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/0a13da52da8e90bc9c60e6e5d94dc5dc/giduvereretituforikozolog.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609d11265fc47---xawetiguseresaregogejapes.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69420101049.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/31409849151.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/u7hppb85j7usosff33nasn3sqm/86528727392.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/607c08fb0b6a45bdf6021147a4942749/nevudirowatasabuvukilipun.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/rezasepejaludinefizetem.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/54166718143.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607258ff8a602---pujatefejeba.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/me4m0jffnj1ce6fb4567n38kt2/39964521827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=consensual+act+meaningPDF 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_off00017e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000196a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196A2 16784 bytes
SHA-256: 6e53e4fd0b0a712d816d55969895fee48f04f124cd6c57e0a4b21107ce4cdb1d
font_02_sfnt_off0001c267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C267 10604 bytes
SHA-256: c288da9ca29fc2871535215832dad8616cd88fb486127514e7224effea267df8

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