Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db4a678ece69134…

MALICIOUS

PDF

73.9 KB Created: 2021-09-03 10:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1b23719cc40223b5573d2b23284cab8c SHA-1: 1614b5526f61317e7fb74d58ac5f01c9d9f8837f SHA-256: 9db4a678ece6913439ba8f9f7da7ad0d6cff6b376b2d96228ddf38d7f132639a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://vetcarefoundation.org/userfiles/file/loxipi.pdf In PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/1266622679.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1395d3cbc---94506035289.pdfIn PDF document text
    • https://ancoraeducacion.com/images/wutedagediz.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/27297345229.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/t7vb9hpvq0j8utsv6t6g2pm2lq/rafilonuxorulejarexemezi.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/804847103b6c78183a4001d181fdf00f/69537696065.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a879ea9bc2---95590183261.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16099a1bfe0ca5---44779498072.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7d950c8a6---19104411765.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/32171763359.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/lupipiwusekofamifokisil.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/benaxogibodugixotokurasam.pdfIn PDF document text
    • http://vejwun.cz/images/38185766138.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b309c7a7c---48676248507.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/39414810530.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e61201417a---xarovupasogajusunakuvib.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9ed2543d3---zifemafuvim.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/21727469980.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/83356732525.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a5eca7e47---69695871878.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160842247e46ca---94587789363.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/faluxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=binomial+series+expansion+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_off0000bcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD6 17024 bytes
SHA-256: 5d0470132aed260b24672eb542f98f27c194a164ce58fd5f8a46e9dd94baeea8
font_01_sfnt_off0000e975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE975 10716 bytes
SHA-256: 9a0ca9059c3d21a37576683de2ed6ef6e3a2cf1f940329badd15252d57c43d26
font_02_sfnt_off00010206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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