Malicious PDF — malware analysis report

Static analysis result for SHA-256 e952a76aeb63510a…

MALICIOUS

PDF

86.3 KB Created: 2021-09-08 04:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 53b350b52ffaffce7e5223a26b4a52a9 SHA-1: f021e3142bc314f1ea105d608680faa4ff25b830 SHA-256: e952a76aeb63510a606d9a759bf3678e52dd29be149f281e4211c3718a7a5146
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to PDF files hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these linked documents. No scripts were extracted, but the structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://istanajpdua.com/contents/files/butexujokomopunamo.pdf In PDF document text
    • http://www.pattyn360.com/upload/forum/files/21331145903.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/47277961794.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606feeef64056---mekagolutaj.pdfIn PDF document text
    • http://lizhechem.com/upload/files/diwotoxekubixoli.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/13728720135.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/sovase.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072d0ca93672---jawesexatafidulu.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd25810fb69---modumitenijutusa.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/83136923709.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/fidobogesafitedajetuvituv.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/javabukanunojedel.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/nixakotafixazu.pdfIn PDF document text
    • https://sankohomestay.com/userfiles/files/51229037523.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/lupomizarivira.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/77196417634.pdfIn PDF document text
    • http://sartor.ru/upload/files/ragiraxijedurijowigewe.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/difidikolutuxaw.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103d62ec894c---35118471352.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a342cbd9efd---94946281505.pdfIn PDF document text
    • https://puppometalli.eu/file/43410589441.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/5413d2ba011b77631ce58aa31ae9fa4e/dogoxofiduwivomakonak.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/pegutu.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/gefitozu.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ithul4kn72shblv1ra7q59aulm/72922045371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=baixar+parasitologia+humana+neves+pdfPDF 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_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 11264 bytes
SHA-256: 5ee7c4364778a5b572d43eab195171fd17568249908a80198b4474b224ae7a33
font_01_sfnt_off0001066c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066C 17376 bytes
SHA-256: bcfde38514551621c3ef3fc5d7d4b361c0e63504b2f675450ba2700b9bd6b325
font_02_sfnt_off00013364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1