Malicious PDF — malware analysis report

Static analysis result for SHA-256 0676f4e5ba7fbe97…

MALICIOUS

PDF

77.3 KB Created: 2021-09-09 09:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: e7be5fbc066f9dc701e04593ea83a968 SHA-1: 4d12f7d008957c1ab271da283dfa351969487d22 SHA-256: 0676f4e5ba7fbe978dcef27f04952d5720cad9f2f47f04b87dd732f23034ed99
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=how+to+transfer+data+from+android PDF link annotation
    • https://amigo-shop.105h.net/upload/files/56159237936.pdfIn PDF document text
    • http://zae.me/datafiles/file/31347920283.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613219d2e72fd---forutuj.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/69838994070.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/12033775530.pdfIn PDF document text
    • http://toroisg.com/public/images/files/dadisamolaremo.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/69207993474.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31326798873.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/dffe6c251911826f769268ae8e0512e5/belewogufuwusoxuk.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/vusifilowafiso.pdfIn PDF document text
    • http://parateam.cz/file/46750647892.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/kadibovuna.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/18706356444.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/16913420449.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b608fbdc38071f8d2d45b651039ef97b/58033271403.pdfIn PDF document text
    • http://marketingnews.fr/images/file/vobubuwimazufusenepo.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/17775921429.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/85724054838.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/wizabotaj.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/lopifekofuzo.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/jelikedunupab.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/lolanafaxunaxugasofi.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/49451116009.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/56920214807.pdfIn PDF document text
    • https://stotex.rs/files/jopobuzisikutufij.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_off0000cb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB98 16968 bytes
SHA-256: 25a189f96fdb21c37378c386652d309b86c68a1bbcfd28035b6b7e58825671b5
font_01_sfnt_off0000f789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF789 10544 bytes
SHA-256: 224d7c5d66f3b3cb083f819e9a145869e173032bed8daf5ea9ff877458e2d3af
font_02_sfnt_off00010f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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