Malicious PDF — malware analysis report

Static analysis result for SHA-256 592f714d2a620b09…

MALICIOUS

PDF

84.2 KB Created: 2021-09-14 13:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e7c3742677ae11d3c3156afec9c1733a SHA-1: e1d5eb305fc83dda474a28bd3e81adbcf8dde508 SHA-256: 592f714d2a620b09669ed198b736e9f70a333357422f32cd503fbce0a9388479
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ezsprinting.com/userfiles/file/nonizodanixemufukowup.pdf In PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6f6abde29---jivobenejem.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/kobofu.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/10079293287.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b7c643974---9277899920.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137c5d5d9ad2---72903835125.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/43615660566.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/43741066735.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/cb8e5d828161a6c567a89c5d1444ef34/gobukivevidixef.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/61690317730.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/pepibefep.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/gofilowavudixivododa.pdfIn PDF document text
    • http://nscenter.cn/upload/files/61602661400.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/papez.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/memik.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/25365635118.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/23499986570.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/debifiwoguk.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/38418256630.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/69379168097.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/44971296004.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613901fa0e5cf---52250925019.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/zazopekuruxoxetori.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161320fb10d059---71851012759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=phone+auto+updatePDF link annotation
    • 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_off0000e451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 10184 bytes
SHA-256: 082c1105673f428d760bbd51d89078b70fbafbd98c5b0f8d66d853bd20410516
font_01_sfnt_off0000fb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB03 18800 bytes
SHA-256: bc2be2b548fd8b59838b33efa223e613a6eb5bd225e58356e6f9ccee77ea0819
font_02_sfnt_off00012b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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