Malicious PDF — malware analysis report

Static analysis result for SHA-256 676d863b0cc00c70…

MALICIOUS

PDF

98.8 KB Created: 2021-07-03 12:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 77460c7f31f40bcb3846df5afca77882 SHA-1: 1807b263561f8976ee7c7eda0a3833fdae70a771 SHA-256: 676d863b0cc00c7088fb99169581910268f110890cee76dca6ae529b175e0051
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users through deceptive redirection, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

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 http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/911752aa404fc314b89a160f805dd252/44791505557.pdf In PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088c61b7c7bc---vuburofodezidozimuretaw.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/072906d46b9619e6f5041178c40d3272/3836832781.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/jewimigebidavutu.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/50744774295.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f59aeaf275---42104412039.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/eaf5a6b5d33d7f27802d07254604f1a5/38839504652.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/576b17dde1941c0de732e348bb521a53/22675809026.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609a76f811adc---18133212708.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16090150af0475---5225029747.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/6kr8j6jrvastq266uc3gdl32j6/soxavepofakexumob.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff021050a3---kuxalisinokid.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/11360416574.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe0b4e1de5---15966074514.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/54429705379.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210701051337427.pdfIn PDF document text
    • http://atomleasing.ru/media/File/pediwapoworagi.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/laae74u7ds7210nt69ch7gbb2s/wenexetubibobetibikexani.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/0mjl56qb0kamhje1i4ms62pm3d/tadugadevinepuvuzamobulu.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0ca4a6894---83714563519.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/98495318687.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/e40ea076a5a0e7513eaed69b4ce27647/wesomulitadefepup.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/822a5bbe21e89102fe87ddea3be22b35/kumukajosivisewizu.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859898b270e---59342250964.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076fac3f079a---30400417530.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/tqgfluquah62pnqmnrtn0jd7qs/zelaku.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160766e78915a2---90300922935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=days+you+can+get+pregnantPDF 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_off000107cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 17492 bytes
SHA-256: a64d0d6efcd22c14cdff62eddc89d563c8f70c27ba3634a6a3f575f51949c57c
font_01_sfnt_off000135ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BA 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off00014b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001634d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1634D 10624 bytes
SHA-256: 76b05e58075a69a8980eeb0600f59e965ec8d7e354992c1d276c9b0b93df85d7