Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63aa91ff84634cc…

MALICIOUS

PDF

74.3 KB Created: 2021-09-03 03:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d93cfedc2b7427880e8d7eff21589d4b SHA-1: d3825ac0d816e48987d7181dfeacd29344724c92 SHA-256: c63aa91ff84634cc2bc9839bc1fcec5b415960b1cd622e3cb4d7a21d04443fb1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URI heuristics suggest it may leverage embedded JavaScript or other PDF-specific exploits to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://pistant.ru/uplcv?utm_term=griffiths+introduction+to+elementary+particles+pdf PDF link annotation
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/a353ecb026075e23bdbb2e05a9ef1bac/fojigezu.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/7697296427.pdfIn PDF document text
    • http://c-six.it/userfiles/files/57021549270.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/27840677220.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/c3c4d8ea88e658805f8ede8cd7473f89/nubel.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/suwuwipokotope.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608692e6b9454---jagatidetonefatezuxiwi.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/lha7gcr92iqgujbp915ri1m937/faxixaluwutowuwovamu.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ad2d251ab---lorefuxotamutivini.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/71183879006.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072cdd1e2380---10951459814.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/guwezorixazufopukivalura.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd6407d8c8---76009350533.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/784fa652d29d498340b0d54d8ef6b20d/18015337578.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/44523065752.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/burej.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/wutarubimatometoxonop.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/05f2870d759000d43f1272690ffe8ebd/nazadovuvom.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8460761b4---94009596533.pdfPDF link annotation
    • https://pfhotel.gr/ckfinder/userfiles/files/judejipemotu.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/81754182241.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/50847387640.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609646a07f287---41935031428.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89420755937.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78D 11140 bytes
SHA-256: eaea18362fcc28d17696a44425d6ed9e46ef78777ca49edfa9563391402f4832
font_02_sfnt_off0000f170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 16268 bytes
SHA-256: 029b1a759094269fbb3b45211eb0882f3ef2f11db5c272fe5aacb44886641ed9

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