Malicious PDF — malware analysis report

Static analysis result for SHA-256 908d7080f7fb4fa2…

MALICIOUS

PDF

153.3 KB Created: 2021-09-05 11:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b1d6b61ad763674d8d06bb19c6d95454 SHA-1: b44349e959c636b95a534a6549672b83a2a20193 SHA-256: 908d7080f7fb4fa283550ee3315b5c3745cd5000b47eb783c5e05ba69e5efa29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a malicious payload. No scripts were extracted, but the PDF structure and URL patterns are indicative of a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9706

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 http://win-sonic.com/ck_imgs/files/kurujipomusupibe.pdf In PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f43e1a292---90324225783.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/93990145095.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210815044426.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/91110792433.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc9f0bcdf4---10838141747.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/3d73adaf3c3bd2a2941ccd10732682d4/gixopovimedobifofizi.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/zukiretewusufakazaseze.pdfIn PDF document text
    • http://hyundailed.com/upload/editor/file/63013712092.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/31627859871.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3821ddeac---rufakexavojolaliroga.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/nalunilegoz.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/eet39l6sd0l7laqi5uorgf5067/88367884261.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160885d9d7a8c0---97582874864.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/zozir.pdfIn PDF document text
    • https://clinicscrm.com/img/files/gutixu.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/sawefe.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/795f53da536a81d63d263932466b7a41/vapojugap.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/69655409986.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f60fe30dd---xivinumif.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/7875938202.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/38793287117.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/89743610132.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/49110402323.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fc1f16a06---rakaxamikilituwurimabiju.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/4346399878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=tavola+periodica+pdf+downloadPDF 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_off0001d3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ebc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EBC9 16564 bytes
SHA-256: c9df130820fcc8f9b047e3def6dcaefda74b9572074935122c0da9764a61ec95
font_02_sfnt_off000202e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x202E4 23092 bytes
SHA-256: 86e2f760f2b58afb166d2a22563a725ef792444b762ac5edee4425a070c01960
font_03_sfnt_off00023e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23E48 10464 bytes
SHA-256: 2b01772de11fbe8820b33284911c9dec8a6a178d95fd886d02362b70fa08a808

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