Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5f07a986be92f5…

MALICIOUS

PDF

69.0 KB Created: 2021-10-03 05:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 74af037d5cf640baa620c561d0504107 SHA-1: 7d005a2e2fdccf565796e98e583e95f674b84659 SHA-256: 3b5f07a986be92f5d08ffbf9159ec24580856ed9f27b14152461e7b20aa7708f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=oxalates+in+peanut+butter PDF link annotation
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147082a8984c---vufen.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/jav3u2qeqduocb0ilip99e7c6a/88177082378.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/71231839523.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/83478321431.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3611442c8---xapuguveverisopijowapewi.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/xisogesuwik.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46902722194.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/65421133067.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/55984678646.pdfIn PDF document text
    • http://sakem.org/userfiles/files/zubukadogud.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/boxakozezaz.pdfIn PDF document text
    • http://contua.org/userfiles/file/jujosoforedod.pdfIn PDF document text
    • http://52963566.com/upload/file/202109102237516954.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/82727432353.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/teziv.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614be32d12d3a---38012606250.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/31193737871.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/nokixilamivofapab.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/0ajjqpvk4stld0hadhaqfkqv2h/94103168392.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/16626636958.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/juserawepega.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/39690019520.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/tokuzen.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/41445382534.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_off0000afe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FC 10492 bytes
SHA-256: 22db73a7502be60f0742484314e9be37751d94c19440a39071af0714c2143351
font_02_sfnt_off0000dfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCE 15312 bytes
SHA-256: e2e0e6dceca3346cd97babcb5ce919a5545306b15aa6e378fac3cbb3c6f78713

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