Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fcb6c9335b87c90…

MALICIOUS

PDF

69.6 KB Created: 2021-09-29 04:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f1ace7e9433f8a663a478e63c980c319 SHA-1: d019b221903162144bbd508651fee192dce140ab SHA-256: 0fcb6c9335b87c908e2656e2cecc0b632c96dd229792493017b096897f8d24d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm patterns, indicating it's designed to redirect users to other potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://wastran.ru/uplcv?utm_term=samsung+note+10+plus+4k+wallpaper PDF link annotation
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/kanadobogojikelej.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/xabafizosugidel.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/9088421430.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/37737635391.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/kugeletasejavizoruzutem.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210918_3870396722DF5A5D.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/36526045293.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2154d8b444a8d9eba0c979ca31138e60/79127205989.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/vomiva.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/83f7efaf946b0357ef477a637bd58f89/91182598279.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/nawanowuxenuma.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/xokobozin.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/83216938660.pdfIn PDF document text
    • http://linyuepharm.com/upload/files/17423393508.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/mobarisa.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/denusizomavunuguritiga.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/92597900441.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/kunegizitadezilukule.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/44903300362.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/324071d4130cc5653595c735624ddb86/24696489370.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210909172246_2099082502.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/0c7dfff2e64940d1ea9e33bb083621c3/88326124500.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/raxujofadarupesedelopixiw.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/76233222061.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/47529901365.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_off0000b013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC825 15132 bytes
SHA-256: 54da11df4fe4a47d6fbbcabfeae8cbfbbd3f8e271d7156e4747037c29dd678df
font_02_sfnt_off0000eebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBE 11108 bytes
SHA-256: 98051cebd4ee3684f6d41d2fe7fa518945bba7ca89c402e78af83d63925b513a