Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88886f777d47504…

MALICIOUS

PDF

83.2 KB Created: 2021-09-25 11:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: afefb9f28e56661eb10d3f90548337ae SHA-1: 98d2b29d7fda2d61622b2c256542a297c1aaf6b8 SHA-256: c88886f777d4750460042bb28402024f9b2d918d0a6a69e9444f6cfb74b448d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to obscure the final malicious destination through multiple redirects and potentially SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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=probability+concepts+in+engineering+2nd+edition+pdf+download PDF link annotation
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9a848de541bbf65c4a5cea945ebe63d9/67092721288.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/3272714168.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/dorexoxalebevata.pdfIn PDF document text
    • https://tomas-music.com/contents/files/riwegi.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/37qb8nh2qi49odtbrk8u7qdjq3/walanosifuzirogetuvisar.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141384abdc1e---65786862618.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/34ce81ffbdb8cb2dd2330263b1e854b6/96165121745.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414164c22fd---gotifowejedegodivakun.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/xotexixozogibodubaxaluter.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/mifibop.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/riwokegebijekiputen.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/xilofarowizaxidisadule.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/35545202083.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/18954398387.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/84004318331.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/sogud.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/gufux.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/80277279754.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ec20a47a5---92526625380.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/42355773780.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148530a10b76---17154270012.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/zutowoduni.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/diporunijamep.pdfIn PDF document text
    • http://theponghop.com/upload/files/64614803630.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2F 16188 bytes
SHA-256: 800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34
font_01_sfnt_off0000d4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E6 11256 bytes
SHA-256: 71106285c0ae34ff9dcd757a4f0c627b4f67a1addc5b6e39a623bce1a336f47c
font_02_sfnt_off0000ef25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10737 21112 bytes
SHA-256: f5380e93e4a83420149423673fcac92ce7ca830d6a34cb2c327f836793d92277

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