Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d6de7017fa25fc…

MALICIOUS

PDF

164.6 KB Created: 2021-09-05 19:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ec8992cf077add75e96fe1b439b4c58 SHA-1: 064551f060c7773adf47973b281bf135a534ccf9 SHA-256: a4d6de7017fa25fcd6ecacb6e43b26a548394f704962f931e1334c5567a803cb
112 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. The 'Fake invoice / payment lure' heuristic further supports the idea that this document is designed to trick the user into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://hv2barrier.com/application/third_party/ckfinder/userfiles/files/jitazux.pdf In PDF document text
    • http://growlink.biz/userfiles/file/dutamosatowal.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/17692522935.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/xewiwizepedogoz.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/00246f43f3da6b444e3d845e35f7949e/82709109889.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/5118685067.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/fokexupovazokopogama.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/73898203355.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/votuvexamogulinapudugi.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/wubogurinajufumebezola.pdfIn PDF document text
    • https://raptiherbal.com/ckfinder/userfiles/files/90503183691.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16101335a57048---fibigamijume.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/tudubifeperitavu.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/0fee42c638d5c984253ce8f19283eaaf/duwej.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/7915382254.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ab95bd01e3530b907be2b35ee78ff504/53628814189.pdfIn PDF document text
    • https://85097781.com/upload/files/5105538005.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/25514251816.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/b55tk16ebtnalhj59ivq6m17q2/pepevafep.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160928f1e96b69---masoninu.pdfIn PDF document text
    • https://aneri12.cz/res/file/mumelet.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780e1213245---65000717099.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/vekol.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/nefewofifevezukagut.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202108210425597812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=vertebrate+zoology+by+kotpal+pdf+free+downloadPDF 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_off0002128d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2128D 10872 bytes
SHA-256: 2f3862ebd0c7c98233889c302bceae218ca4631b79b0c255bbcae31ad0a43aca
font_01_sfnt_off00022b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22B87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00024399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24399 24676 bytes
SHA-256: 9fe0f26d0362481991330088a53a133fbe48b0c70f925b4d08f913b7ae16d737

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