Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf581cd773a33302…

MALICIOUS

PDF

86.2 KB Created: 2021-08-25 21:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b02ca7694f53f8f5e9738cf854f8703d SHA-1: dd11688ccf9e04fed99c9f6bcfc86c15f91b9e7a SHA-256: bf581cd773a3330223ebad1e50a6f57b93652d0585280a2fd392970c58f5af74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially malicious websites. Heuristics indicate these links are designed for SEO manipulation and point to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=importance+of+time+management+in+the+workplace+pdf PDF link annotation
    • https://mimpiindah2.com/contents//files/xorujaji.pdfIn PDF document text
    • https://www.verimevzabavu.sk/ckfinder/userfiles/files/rusosefupewepig.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/46321688149.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/27200279982.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/36021046187.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607789506fe0f---dugodu.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608192f6aa42b---jijuwipabexulugiporinof.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/av5gcrm1bssethnphmu3ugqmm7/94335679095.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99343851729.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/pulubinavurimawisokaj.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/metanojovi.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/61561918903.pdfIn PDF document text
    • http://vhshf.de/File/luvexatufinubawipis.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/577860a1cb2e153ded01b34da32130bf/52360043748.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/21810742672.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16124c374aff78---17640196883.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/mewalakazumitef.pdfIn PDF document text
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/55578520041.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/tinodokijitufetuwixasuna.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/lubazazubas.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/ximomusezirokiwijat.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a450d9e91---pexolilupalem.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/vadozufalavase.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_off0000ef13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10725 16500 bytes
SHA-256: f4e538af6019282a8a04318f347dc75a99b6055fbe23bc8b5601a777c16402fa
font_02_sfnt_off00013174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13174 11028 bytes
SHA-256: ce97c7ef1ec03d61d6706d231fbc1057701f7b74c899c0553edcc8e850de3422

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