Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da9c386cc122932…

MALICIOUS

PDF

80.0 KB Created: 2021-08-18 16:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f6c6fc3e0c65a970c46b48c9f2cf6074 SHA-1: d554b2704b542321a7f0fe9613fc28075c2f7ce4 SHA-256: 4da9c386cc12293278da4088c6b1a5666533cfdc888dec102ac46233d94f6eeb
196 Risk Score

Malware Insights

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

The PDF document contains a social-engineering lure, instructing the user to install a browser extension or update to view content, a common tactic for credential theft. Several URLs point to compromised CMS uploads and disposable hosting, suggesting a distribution network for malicious files. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf77881176---siwiwufefawajozapi.pdf In PDF document text
    • http://tonioloclaudio.it/userfiles/files/xiwopinoloxokusubekow.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3161725210---sinijosetebasu.pdfIn PDF document text
    • https://healthcareadvisorsgroup.com/wp-content/plugins/super-forms/uploads/php/files/aq3h3sg5paof16ogcaod274i65/51596884228.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/b52dd32826a9d1dda8fe00cb1bc0e809/gavaxipadi.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/peserezexosederamalu.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160751c478f279---jibaridekipubetosojasuvej.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79ab47bc84---38223296213.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/kao1rrsj539qb3aledbv6vknqb/voxedupaj.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/kebovanepa.pdfIn PDF document text
    • http://jessicarossitto.com/clients/7/7c/7c16b8c799dae9ffcd1258f31d6ff645/File/225438113.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/17887907209.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/32147468346.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78e1749b6---66348959099.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/xesuderopofepoturafigewi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbe62cfcc0---92809445177.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/bujakifemikinokewowimud.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/abfc51bbbb2076c060fb5e58ab9967e8/56814683917.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/13280852466.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/4017376965.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/kozadolatatuda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=compilers+principles+techniques+and+tools+second+edition+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F8 11164 bytes
SHA-256: ed68bbd1a4fdf6a2721f061fab690a964b858d240670edccfc5679e8e5d31588
font_01_sfnt_off0000f09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09E 16068 bytes
SHA-256: bd1344d4e2323737fdf65e029014928aab5cfaa055f0add5a447bbc12530ace5
font_02_sfnt_off00011a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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