Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5df8069631703d4…

MALICIOUS

PDF

86.2 KB Created: 2021-09-17 22:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9fd377c793aafa13d7ebd7d70838b602 SHA-1: de4ec82c2769d9f0961a5df652598eccd6376f68 SHA-256: f5df8069631703d45821d75d78bc946e819854aaa5bfc8262b428900d572a81c
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=ludo+crown+apk PDF link annotation
    • https://tjpapigroup3.com/contents/files/faboxak.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/gurufuj.pdfIn PDF document text
    • http://melvin.cz/data/57382117073.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/85028854517.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6693e8261---konodin.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/bezesi.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/rfm4q11k6nfnqb9g5ie6n94p2u/61724259620.pdfIn PDF document text
    • http://asvpp.fr/pdf/33203468180.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/gezulewosaki.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f5ee7c78e---zejaf.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/dozujatenafoso.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/doxanopo.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614484343cb43---60213205442.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/bepemosiwinipuwitaluv.pdfIn PDF document text
    • http://stylekd.ru/files/47159878198.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/30670341491.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/926404297.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e10eb1a541---farowam.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/8907369122.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202199_191945_783.pdfIn PDF document text
    • http://bndweb.nl/upload/files/rixilewezobaz.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/sufaserotarin.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_off0000e471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE471 10204 bytes
SHA-256: 74feef225dbd65ea850879649a7d5e42cd468f8e4623e13e6c40435a57cfe369
font_01_sfnt_off0000fb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB70 21204 bytes
SHA-256: 532418b19ba57666162bcec9822a00ec313d4ddd20b6318721da7314f81dcced
font_02_sfnt_off00013293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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