Malicious PDF — malware analysis report

Static analysis result for SHA-256 186f06571093cd2f…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 22:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: be64cc7c1a0474a45c3755584b66c7fa SHA-1: 144de6fd3723a0c2f7cc467dc9dc6e1858b1e822 SHA-256: 186f06571093cd2f1ff5d47e5526dfce353bf02b02c7c6bfe0cfc9f150951b90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs that form a link farm, with many pointing to compromised WordPress upload directories or disposable hosting. The primary function appears to be directing users to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inwebjor.ru/uplcv?utm_term=heading+to+meaning PDF link annotation
    • http://duda-tech.pl/dudatech/upload/file/zibadixoxodugevefixesu.pdfIn PDF document text
    • https://ip-pharma.net/data/files/podajikuzebuve.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/e760f65bb01de35e7927e9caabd56c7f/boworetelijukejota.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/51747095494.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021061713003129.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/9854019975.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/dme04vj1c4qmt1mk3sde75rv8l/11763198312.pdfIn PDF document text
    • https://onlinendttraining.com/files/kopevezulufukam.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/fd742c5d4550f5bee954c7e809927e1d/dutipenoduzowerapoja.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/50554148069.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/e9d36cea22ce966b05fdd368d98f57ff/90109430003.pdfIn PDF document text
    • http://greenbrier101.com/userimages/23928310522.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/o4itsh9fatl7fjeutpgreamrj3/bodilegiline.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/67470453283.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/kusoxazubabi.pdfIn PDF document text
    • http://agavietnam.com/img/files/67226189954.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/578800a5f7fc9a8533ba3d8dc6ee7638/xevefunagafoxifofuj.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/19701497518.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858f7ca4fd1---jizivetutakepek.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/e2i2u6hjeldv5un7ungdgl9g2f/kajesunis.pdfIn PDF document text
    • https://people11people.com/uploads/File/falefewufakoku.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/7173acf5678e90d0eba103c7308c5585/85243804774.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/32618374070.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_off0000e300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE300 18364 bytes
SHA-256: 05ddfe7fe77848e1991e0a3ed7bc0697ad30f9e2c4c5a79632fb12cc2a451c53
font_01_sfnt_off00011233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11233 10268 bytes
SHA-256: a7614d80e3a3cc7f9dc5fe1337cc681b103210cab0e57d05fea90b77f521ee4d
font_02_sfnt_off000128f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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