Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e97aedc22007c9…

MALICIOUS

PDF

86.1 KB Created: 2021-06-26 08:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: aaf3353edab24711d3b9af6bd3aba245 SHA-1: 9afd39f2ae16055f929961daf6fee21784ea9786 SHA-256: 91e97aedc22007c99bdd7c71a9959fe3890baa6ee0d326839c5e62d61913c689
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or use WordPress upload vulnerabilities. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the nature of the links suggests the PDF is intended to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ketchas.ru/uplcv?utm_term=united+nations+logo+meaning PDF link annotation
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/n5l71l9rb0qg4no264gtcjrol8/kajegulenamirupifos.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/ba77bbab9137c7e964fa50c5fe4c0d13/41113145530.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/jubifitet.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160982e558999b---54866738739.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bce225957---17772387557.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5442503ce5---26371945124.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/57672478410.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/i8vmeu0045pipcsvc6prth1t6c/44787808441.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f28aa4ed3c---lexevide.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/60743234951.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/10f9013957e67b15f31a363a3d011ba9/vebesipaxidekep.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a259a4e93---bejomedawokanejiweg.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/43e5878d68d5c717e20019ff8783181f/23943541471.pdfIn PDF document text
    • https://numberonerevolution.it/file/vuzuw.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160840ffa645cc---16154687662.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/oh10pflma27oi85fmpl8o3pppf/75619670620.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/ziruruvotulezovaw.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c7c59d6ca---nupisodupanigixarogek.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/00a2c5a141199f259b6f54b2d0fa6a60/poxawewiduwat.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b623ac1e95---vulutevexitila.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/guxafo.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/3b787eb6cb630d0188adfab20a10d7d0/tufazarukupida.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/karoligexatesofod.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_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10760 10500 bytes
SHA-256: efd5b2c7e09fb6860ee0f6a306b57072ae4119e8d7364a0f93ecf59d099fc51f
font_02_sfnt_off00011efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFE 16540 bytes
SHA-256: d8cb84388f5bde995656733cf11c48f5a0e66f9d45969e4142d91064d589a0da

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