Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e800579f91d665b…

MALICIOUS

PDF

78.9 KB Created: 2021-09-01 15:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8333670d8077db8a4439396984661c09 SHA-1: 18f4f803327cfe0dcb6846dcd7edb1fbf90c1886 SHA-256: 6e800579f91d665b0da682df32476aafa9c5045faa97d7f7cc8c842e48ef242c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, designed to redirect users. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://tselectromechanical.com/uploads/CKfiles/files/zetenasarikadafuzadomi.pdf In PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/2ab92e25f80f9267e0352db028dd79a2/30518783926.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/26885487444.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6d3104272---24637273397.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/59612417447.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/4rrgodlktjolhbshqk6ipcu8sm/lowebivixolurawi.pdfIn PDF document text
    • http://biomehl.com/images/content/files/fesimanizurin.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d386898c717---32886704150.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/tirudowotunutugetenakilaw.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/feposalonogusikonifanam.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adafab51f5b---kapasavusokume.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9cccb012d2---13703264347.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fitewar.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/zutitegafunifemi.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/7fdea12f56ea4c1db31c83715031391d/93562316169.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881c0021e5d---potoxibenutonekivo.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/20892597637.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/5d13b17e936aefe996cfa3d92f951613/83520567393.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/loken.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder//userfiles/files/tepagobufowimove.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/3dc5pfm4kpcp2kdgu80qbsisu6/begebigaxofasurazetesam.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/arndv69tp7nh0jarfatvevcljj/jolutazap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=haylou+gt2s+manualPDF 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_off0000d32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32A 10452 bytes
SHA-256: 3ec6c277696cdfb6096545011a86cfe77124c36096c099a58fa372e8a3ab5a0c
font_01_sfnt_off0000eafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 16828 bytes
SHA-256: 7c8f3febede94d605f2dec238342163102fcf030f08893cfab77b6e121e81ed9
font_02_sfnt_off0001163c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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