Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7d44080390e571…

MALICIOUS

PDF

86.5 KB Created: 2021-08-25 03:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7241d3a204f905a0745798b17cc1b2e2 SHA-1: 042c829894f7af3a1300d99e3652e7f492e08d84 SHA-256: 6c7d44080390e571f91c256c047e5e37060d5c331fcb1227c47719f8af54793e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing or trojan PDF. The primary function appears to be directing users to potentially malicious content hosted on various external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://simon-daulte.com/ckfinder/userfiles/files/zugotukugitaniropu.pdf In PDF document text
    • http://asiavent.com/UserFiles/file///54454043502.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/jozutegefapozex.pdfIn PDF document text
    • https://wrd13.com/force/file/bavugesobuvexire.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/9dbc8a53093e5ec1d152a3683bcb6fad/16904397891.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080120347af0---64179787005.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/belegowijovubu.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/bc3d093607bac69bfa79b6ea04cf8c86/banafefer.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/limigatemuzekejatupag.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1d614789b---dajodeti.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b38dc9e48---weberisojajesavapofon.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/kejuzimoxovixigud.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/17876066982.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/3f89f2c913b20cf230e7cb2fa84727ca/59432155013.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2ea13cd8a---35798470055.pdfIn PDF document text
    • https://kaimano.it/file/kutexakulef.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/nakodibaj.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/zalafukumepojeja.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/mepigu.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102538096b7c---vegazokomumaji.pdfIn PDF document text
    • http://cmtsport.com/pliki/49985805122.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be9d82b472f---75848519166.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/2e7f056b44890a3e81c721e4bbf19411/87240079223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=definition+for+nebulousPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 17460 bytes
SHA-256: 53283844267fd21146714de5aa43c821f8729cbcb0d747b74b534414480f2d31
font_02_sfnt_off00012021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12021 10288 bytes
SHA-256: e8a4ad2f03b515348ba727bc9977462277b722adfeeb57aaf48c2bad175030e0
font_03_sfnt_off0001376a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376A 16060 bytes
SHA-256: 8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825

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