Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec79b56f55aaec1…

MALICIOUS

PDF

89.1 KB Created: 2021-06-28 07:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 923c3f8181d33f47587fd176b5c42c82 SHA-1: 3bde81574dd2bc8a66aef18153154c29870b1dc1 SHA-256: fec79b56f55aaec1c000ead3ce790848aa7f06d83a61e3dc623d2e65cf3d17a3
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. The embedded URLs are designed to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/bjgknik9ii3hpf7igenif54r89/85765734286.pdf In PDF document text
    • https://hospvetcentral.pt/site/upload/file/81572073756.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16082b6b8a0ea2---87617405204.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/72282451192.pdfIn PDF document text
    • https://combrooncom.com/contents//files/redigomamoribefinibum.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/96003853013.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f591594e02---52659802909.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/55604683600.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/2dm98h1dr3iscg7fs8q9gqvfn6/dofaligavikibimudag.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/95051244535.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/e1ada848ce34980d5bc45c276e331690/47557890873.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160d26f1ba8076---dimirifipobuvoj.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073c292c29f8---xixowajurobok.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e35774eddace631d7a7efebcfe1ca59f/wevasokejenuzimujag.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffb10d0770---jososibebigup.pdfIn PDF document text
    • http://airsoft1.ro/files/file/jebitimalozojofasisame.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8be2a5059---92270691377.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607557a81fa88---xixuvukujazinudivamu.pdfIn PDF document text
    • http://cucthongke.vn/userfiles/file///30112319707.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/drbnqtgu42r12tjsaqqetdgeej/jukikam.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160747930c4548---razoruvu.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/64kje2elq3drhl8eeqcfup6h5o/bofalosedamawusiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=standard+form+meaning+in+mathPDF 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_off0000e25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25E 18108 bytes
SHA-256: db818518a919f6af9616473ad283e3f937e040f8285527565c76838e6dc2471e
font_01_sfnt_off00011230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11230 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
font_02_sfnt_off000127cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CD 10660 bytes
SHA-256: 1e8c88dd070d8d3cd11d18e040516485ecb844075bcebe4aaccad09d5c5a5cea
font_03_sfnt_off00013fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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