Malicious PDF — malware analysis report

Static analysis result for SHA-256 b484a4954ac3645d…

MALICIOUS

PDF

73.6 KB Created: 2021-09-09 03:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 24d8ee2ccd7e972c2fa3d3b28856994d SHA-1: c3f95dfc0a605aa45cef97f959ad2ed538b5b694 SHA-256: b484a4954ac3645dc69a69722d6f44d4d5326b034a9ca37bc98fb462012384da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and numerous external URIs. Heuristics indicate it functions as a link farm, with many links pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • 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://coretry.ru/uplcv?utm_term=9th+maths+samacheer+book PDF link annotation
    • http://koreaseowon.com/ckupload/files/24268564887.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090706435573499.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/nunuxagufuwadaferokiw.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/1562490855.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/wowigupebabelekiniponifo.pdfIn PDF document text
    • https://wittnebel.dk/file/venodusaxadepejowepovet.pdfIn PDF document text
    • http://smogy.ru/files/files/bawopadeg.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/gazuravi.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/188944820861382741ce735.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/boruzafigakuzapika.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/29467734792.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/bezutun.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/27929208037.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/zedilemudidasubupadudulu.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/xaruzoduwipopolimekiju.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135836f6b81c---venijazubupegakuvusununo.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b61b76610f572728ac35a5544b536c5a/gebederitobe.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fde938871b---62967735382.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161337ad38be5d---37089464839.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/67762383901.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/33412541263.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/21907729406.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_off0000bba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B9 10556 bytes
SHA-256: ebc1833714f05dcd45c79784d76042e091efc36ba0335edfb6fb3a79a1939d0b
font_02_sfnt_off0000ebda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDA 17504 bytes
SHA-256: cb536256a3310ac1de8ef68633003ddcba9ba6bf05f677d64c56c73f7953f98a

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