Malicious PDF — malware analysis report

Static analysis result for SHA-256 c329ff8ffba91f7a…

MALICIOUS

PDF

91.5 KB Created: 2021-07-07 22:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2e7d7117a44defb1e62e051f58abb6bb SHA-1: 2de156ec08811a66cd1fe715f74bae5ad3d18920 SHA-256: c329ff8ffba91f7ad7db01e28e3ff6c0c5ed06ae8c4d0154f42f1255cfc4ef20
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and ClamAV, indicating it's designed to be harmful. It contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or redirection attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd7072478c---teguras.pdf In PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/47co8r0mu4rossgch2tns7ngt4/levitaziwedagedodasin.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/18881841397.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c25f5f7bd86---61727612958.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af2169e4284---sumikanujupozu.pdfIn PDF document text
    • http://ahchala.com/img/file/fufuro.pdfIn PDF document text
    • http://runningrhinelanderrabbitry.com/clients/875187/File/kowesunoreliwisosidoz.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/34372594415.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083a0a28a73f---6044093160.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/rimebilozib.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f1b46dcb2d103ee7a997a44ba95cc8a5/20445430352.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/21c3bc79d501ed8321bd87fa2b889ac5/rurabekoxoli.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/lppp07ob15hir3aa0dt78tqj9h/53868345824.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/66979475914.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/8ce014be6a0b06c408f7646d7120bb34/39918904265.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160984767b8e31---15572635424.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/kutaniwanemixadefut.pdfIn PDF document text
    • http://fedoro.ru/upload/file/63448355872.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/tidm5ils5h2hvubisjoglsu3vq/88065425964.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbff80aa760---pipug.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160be687875edf---78093831546.pdfIn PDF document text
    • https://raptiherbal.com/ckfinder/userfiles/files/70048406644.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/7da09b9766849be335ffa68f3a6fd7e3/serilepivujunizaje.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/27e31b81a005cccfbb652f3928243dd4/vorexinu.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/nd5p9h199p33qnq7mlpls6aar7/28263573808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=present+continuous+and+present+perfect+continuousPDF 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_off0000ecbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBF 17204 bytes
SHA-256: aa226496400a339361d8a5c56e34dc340f631bf47c93b7a8540587db14c23bed
font_01_sfnt_off00011976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11976 10668 bytes
SHA-256: 2788b987fdc18e57935e6f28880164d32647fcaeb374b98f45bee13f615d6397
font_02_sfnt_off0001320a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320A 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_03_sfnt_off00014786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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