Malicious PDF — malware analysis report

Static analysis result for SHA-256 4889e6768dc80e69…

MALICIOUS

PDF

74.4 KB Created: 2021-10-04 03:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6f3d0ec6b4083402c3c6d67bccd12b71 SHA-1: b53ca1492bbdd050e77341ebe9a975abc027f4a0 SHA-256: 4889e6768dc80e697b8372e2aa039b3f12a033d30d86ffc7239c5007526b7de5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://laborke.ru/uplcv?utm_term=the+difference+between+business+and+entrepreneurship PDF link annotation
    • https://hockeymro.ca/docs/file/90257108103.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/12645993229.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/wonubezoz.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/31119296614.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc91e08c93---43817390811.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/lipoluxi.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/83016727522.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/fixuxas.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/57220263381.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/xijapawuju.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/kasox.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1615804b65bf0f---sodipubuvagazamupefe.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/f5c366660968e648f1a3c41e565820c3/paletudisipagetamanuf.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158905cc5568---viremasimeni.pdfIn PDF document text
    • http://xn--42ci4cc0aric4a6dd7c5af9nef7sg.com/userfiles/files/pimexedim.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/6a2eeed69b2d26969fa7d6c577ce0f36/87808259082.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/gurududuf.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/wurunok.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/22df33460a29f157a67db6c01e23e3ab/46757464693.pdfIn PDF document text
    • https://steammining.com/userfiles/file/nizomisosuduvumakanoke.pdfIn PDF document text
    • https://orangerun.re/photo/files/23602360143.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/raxawar.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/79a9f0a8822991b1442458af8a22d8aa/88729887026.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/pozasexofoxizijelewikimu.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/5110759618.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16146564a2568e---vuzoxevuvabesaragavetuwi.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_off0000bf1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1B 10840 bytes
SHA-256: 5ea1e1286f09dba3e70c048a5f0d7eb391e2ebc61c4400ea11283425e5f43b45
font_01_sfnt_off0000d7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 17372 bytes
SHA-256: f22397f49222f73c6f9b580d9ed2b0c669ce86bfb2e980439d92e280ef40c99e

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