Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b91a1381007ec6…

MALICIOUS

PDF

79.3 KB Created: 2021-09-12 01:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 255fc5d6d65f7f97548e5eff96784e44 SHA-1: e9db1c6f676dbcaad255208a17ed3a5ca1806274 SHA-256: 34b91a1381007ec68123a3e4225b5b012b615400b67fdd21659e4816f79d1d3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. One prominent URL, 'https://garglob.ru/uplcv?utm_term=switching+from+iphone+to+android+and+not+getting+texts', appears to be part of a phishing or scam lure. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=switching+from+iphone+to+android+and+not+getting+texts PDF link annotation
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/3337efd47fb5ed41937fef1655b00712/83888577869.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/mubuk.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/fefalepitofe.pdfIn PDF document text
    • http://kadet-ck.cz/pic/file/busilarotevi.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/pewanubafivi.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/wusuzulewawuwudiguwix.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0dc10aacd---92436608032.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/kibjv13jnhpjvievapu62pmsvk/42926982905.pdfIn PDF document text
    • http://signauction.net/userfiles/file/giporisinusiv.pdfIn PDF document text
    • http://stevis.cz/files/file/puvagelexi.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/39379297643.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f337d8e163---40587826900.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/gokebuxaka.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/dcee3b6777743a1df177abfa4b103e2c/73717346738.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/38753410176.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/23971938792.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/47096453775.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/lisusigimukurijujufexemuj.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/53271496462.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/40232058522.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/5923799244.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/guzafabexol.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/lelirotaxaguzozode.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/koliselopumuloze.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_off0000ced5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED5 17544 bytes
SHA-256: 48cb3603bcdb958113c6986ba3bded9fcdc29f6d763ef54a71f6a891a9093000
font_01_sfnt_off0000fc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC62 11284 bytes
SHA-256: 3c2ebc464b5de14d4d394f670dfdc19f9887c12e1d3857462c9cb037f7121b27
font_02_sfnt_off0001169c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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