Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d80de129f83ae52…

MALICIOUS

PDF

77.0 KB Created: 2021-09-20 00:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 49ed3067a20e6ce0f74d0f163551f758 SHA-1: 94c9dbb423e579ec912453e4903c9593eef3ec7e SHA-256: 9d80de129f83ae52aa704a334bc05f26b014aaabdb41a456c4b1e5d127838b8e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. While no scripts were explicitly extracted, the PDF structure and numerous URLs indicate a high likelihood of it being used to redirect users to malicious sites or initiate downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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://krisoc.ru/uplcv?utm_term=car+drift+racing+pc PDF link annotation
    • http://ucg-eg.com/userfiles/file/bilibuvodapavez.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/84120ac8fcd274bbf1dfb5526c5f5457/93382668545.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/61844379838.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2e8f1c250---39867164443.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161444ed67e608---87376364496.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/10871691178.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/86153283564.pdfIn PDF document text
    • http://sial.pl/galeria/file/xuxilugugusozidifilalimul.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/furugorov.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/lakodazuziwagozagidef.pdfIn PDF document text
    • http://chipmax.in/chipmax/ckfinder/userfiles/files/56324849110.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/nozeliwebulugogewelo.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/3898146817.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/abmuat4ub1nmabrg7703pb50b3/todiwel.pdfIn PDF document text
    • https://ccskin.com/geektic/files/mutupofasurasotonafi.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/kizivozawirotoxusonomuw.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210903233401.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/65641318589.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/69677649860.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/83010289089.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_off0000c9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE214 10360 bytes
SHA-256: ff6b6144c32000ce6e7c74f22ce332365b135c08334bb4efe2fc32a11a60ec89
font_02_sfnt_off0000f95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95E 17604 bytes
SHA-256: 9d8c999516c284ccdfc41dbcf1cb7f9ad70ce5434326f5be1a1b3123fddb45cf

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