Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc81fa85524c3c7…

MALICIOUS

PDF

113.1 KB Created: 2021-07-09 18:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ae59b44487cfa7d44df2806834eb45ea SHA-1: 40c8f834e01df1b0d15293152b7d7757496b33eb SHA-256: 8bc81fa85524c3c71dae8eb6bffd51dce350911db3d49c24e12992ea5d001760
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to potentially compromised WordPress sites, specifically within plugin upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farms suggests the document is designed to redirect users to malicious infrastructure, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://asirius.su/wp-content/plugins/super-forms/uploads/php/files/0d219164b2de9c606cb2a9789e9b54f6/kivazuje.pdf In PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/71463905101.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/xolorozexupegonekufapesaf.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/70845377593.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a8a470f17---xokefuvokobafi.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/9aad4b9e11e98b1c708b6ff607a7c208/zilifok.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/dawubigamotaporuwixifeg.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b44e5b3fd58---julexoxaseg.pdfPDF link annotation
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072009dcf07f---punis.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c372f530bea---25744128307.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160866be753e41---92377687370.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/94670599458.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/polupefasute.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba06df26f1---74024262127.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/44171062306.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609881c7401bf---95643135428.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/xixazupuwefonulux.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/daveledixarawotazasit.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/bazululoselif.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e1bc8dc10ff---buxutoniwewegakuborarunap.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/40784334996.pdfIn PDF document text
    • http://webursitet.org/Files/file/48585483818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=economics+is+about+allocating+resources+for+doing+which+of+the+following+processes+involving+goods+and+servicesPDF 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_off000157f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157F5 16728 bytes
SHA-256: 28b9e12d9ba76a371d4b52e53a2f142127def1971236267786b9995e8663fc2e
font_01_sfnt_off00018358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18358 11440 bytes
SHA-256: 0dbd0b35444da9f36074d1d1fb6eec5ef15a9874d6386aef6e43245cbf2cb481
font_02_sfnt_off00019dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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