Malicious PDF — malware analysis report

Static analysis result for SHA-256 d859eb09d49a56e4…

MALICIOUS

PDF

75.3 KB Created: 2021-09-01 21:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7f128a9165907c0af929eac8fb4a9987 SHA-1: a5e55bc9db350ec80c39eb30028e42f5784ce81f SHA-256: d859eb09d49a56e45ab2049db531559888d8813468727bb0200a44f4ba4fac0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external resources, many hosted on compromised websites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristic firings point towards an attempt to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8pefjlr0auemr4af7pd5khf8m4/kobagivofabiwigizofoko.pdf In PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161267a86e1288---18371766675.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24592619140.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/037b98966980021ecfea64045ee1de41/63955032651.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210622_151212.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/fufin.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/fejexi.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/69871534920.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160f8fa35d70a0---nutev.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/41406031675.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/97765b1d61927bda8750a5aa01488dea/fumuwozekinokokakafep.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/turot.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/rojobuxagutuvibonuvo.pdfIn PDF document text
    • http://plncse.hu/php_data/file/43284399511.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/12728798091.pdfIn PDF document text
    • http://nensi.si/upload/file/tuvosovonovapokupi.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/61518704245.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c46738829---47177286547.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22c122dc14---77091009368.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609de3d372b61---jegekowerujeda.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/wozomaxeminagotemudow.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1b9145f9a---tumoxevesajuwinuri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=download+free+pro+ps2+emulator+2+games+for+android+2019PDF 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_off0000be5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5F 11488 bytes
SHA-256: 2384c03e5f29c567109d73ee4797fb0a7b7b2cf10c590e958df224ee64197e62
font_01_sfnt_off0000d976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD976 17280 bytes
SHA-256: 90cbcf8b4dac0646c4fe724b5291b3d59a209510d27cee205b55883808efa57e
font_02_sfnt_off00010655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10655 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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