Malicious PDF — malware analysis report

Static analysis result for SHA-256 1889053e255e28ca…

MALICIOUS

PDF

77.5 KB Created: 2021-09-08 02:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9f144d739f63012da660fac24a23c3e2 SHA-1: 933ece30ca56bfc01e020308e93364ea9c3c2fc1 SHA-256: 1889053e255e28cae43928af14c3a03e5627aa5ce0a08c01dafd68b53984911a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.algeos.com/js/ckfinder/userfiles/files/98084432470.pdf In PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e8b14b6a4---suseravekuwa.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/73975159008.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/mibete.pdfIn PDF document text
    • http://farashimirooz.com/files/83208306829.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0ec87f743---muruduxudarajudodubake.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/30764537938.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/60169848158.pdfIn PDF document text
    • https://bliznacite.com/files/vopuj.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24e933f770---nulelupupuxul.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/satirodusedekekojekulev.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/dovemuvar.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/vubufizipupozuligir.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/5771952842.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/9f7c7bf51964013a4cc7718144186315/25598371421.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/56204282125.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/97834510613.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/jabeneb.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/pekifizobuwi.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/8312abf4a27388242ec08f2581c22deb/60538225911.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/46347270826.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/8da9473b9155910fb974ffae4f7ed984/85937292591.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/6478756643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cell+city+worksheet+answerPDF 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_off0000ca27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA27 17468 bytes
SHA-256: 93b138b16f47cda5e1f118c415fc49f0ec1e33fbd530869653a831b362b41a48
font_01_sfnt_off0000f7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E7 10648 bytes
SHA-256: 95ae0df827f25747c494e5bc5463ccae528882fe119c0789912410682b8008ed
font_02_sfnt_off00011058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11058 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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