Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc72b3755336ddb…

MALICIOUS

PDF

95.8 KB Created: 2021-06-28 18:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 86e8e9fd3878cbde4ca46ddd2b45837e SHA-1: 431278d20f7881d5251266db036d5dfab37775be SHA-256: 7bc72b3755336ddbbf8677c363bb00010b797c54d09c3bd2ecef8d755fa307d5
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document employs a social-engineering lure, instructing the user to install a browser extension or plugin, which is a common method for distributing malware or stealing credentials. Numerous URLs were extracted, many pointing to compromised WordPress sites, suggesting a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://coretry.ru/uplcv?utm_term=pc+performance+test+online+free PDF link annotation
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/91aa0c244083702282ca30e9baa2077e/womibepezuxuse.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/08712ea186d9798deb565f5be1f430c7/4221040148.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/96730982167.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/wuzaxubuninizakitexotizi.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/3gvj7h3d66oatre62iqng794nj/dubadofolajekuwapegow.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/dabuzudesoxodezimesu.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/tipewazem.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ddb65a1ef---83522677681.pdfIn PDF document text
    • https://avela.md/userfiles/file/45233999000.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089769d43fba---29222697498.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3f06bfd29---4981305880.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b63d4e612---18010100970.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac87a9c1d14---tizumuvomiwadewituku.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/8c5dda6951b07f72ffa3194391230916/sipakuzutuduvonunitexut.pdfIn PDF document text
    • http://texmet.pl/userimages/file/xutotisatitobowoxuwudefe.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7b8e60bca5d6ac1014eb988cda98fb90/28765054138.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/16429988343.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/41230372815.pdfIn PDF document text
    • http://goref.ru/files/file/fetugiviwali.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/fefekoxoberudem.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/007ksth1ubfb0i1v1nb6a06o40/figotoxofeb.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/8768b8caabe46955ba0b8f7693c1b0f8/zaruxaxixo.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/24180354012.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/15509914412.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/42a6e8c21740a4e15411ed2770ae357e/mepexusefegusilepixivadij.pdfIn PDF document text
    • http://stroi-sistema.ru/img/narisojadud.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 18140 bytes
SHA-256: 59ed883c68c9c897c3c8aa9d6b0bd253df7673c827be7ebb5e71e289a3471e52
font_01_sfnt_off00012933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12933 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off00013f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15755 10644 bytes
SHA-256: 89a1589e928e125d812fb041952949034a53e71b03cf84dc83e71b9ff949bdc7

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