Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9463947c9d84fc6…

MALICIOUS

PDF

87.7 KB Created: 2021-09-19 12:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ef91fdcc168fa71a155f2e34137deae5 SHA-1: b74ef8f52b7cfb51546f075efcbb3a9998759e26 SHA-256: f9463947c9d84fc6842948e5b90a398d565d9baaf87d9dd80e24eb758da4e4fb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://garglob.ru/uplcv?utm_term=emma+frost+first+class PDF link annotation
    • http://nissanotogovap.vn/uploads/images/files/40388595533.pdfIn PDF document text
    • https://uangraja.com/contents/files/76838932915.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/8082ad8628441f15f9f4f10bd90583c9/bejebib.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/72471528667.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/47969782475.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/lelomijigasusiw.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/funizimexoxulir.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/94790500740.pdfIn PDF document text
    • http://hmed.vn/upload/files/2536541828.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/d30903eda5974f1d802d28072b0937da/84805286402.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/67114045457.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/xunowoperu.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/46842094258.pdfIn PDF document text
    • http://inphilong.com/upload/files/56273685528.pdfIn PDF document text
    • https://posh.hr/files/30103152136.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/19656210896.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/55797196172.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/venoxaveg.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109171537182254.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/38920338730.pdfIn PDF document text
    • http://rnralpha.cz/res/file/xopox.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/miwiwibanixofixekonoxewa.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/sqfk8ar0j77ie34qp8dtntd63f/14834054557.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/xokogutofixiseseboxixas.pdfIn PDF document text
    • http://liluby.com/upload/file/ziropipujajigezal.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/23100119394.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD911 18872 bytes
SHA-256: c003fd4d274127f12ab0ba301ec43f827ad8a39c028b13359c26e8d51f587d4a
font_01_sfnt_off00010a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 10244 bytes
SHA-256: 002061901ad4e3c81250e43748d0318ee449dbc281440d1aaafdac1aa5b2a879
font_02_sfnt_off00012105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13916 16840 bytes
SHA-256: d87a47d4bcb302b27135bb84266a8de6a3c2fad7001472d53cd842988bcf85fa

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