Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6cb836f3c623f7e…

MALICIOUS

PDF

87.3 KB Created: 2021-08-02 09:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 35260954e55e9e0d33c48c6c8bd08016 SHA-1: 696b4d5d6038585a488fd784eb1340cc5961a8e1 SHA-256: d6cb836f3c623f7ef4c24ff7f8d2070a929b5e169045eaa3a234b325df47d921
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document's primary purpose is to trick the user into installing a fake browser extension or update. While no scripts were directly extracted, the presence of numerous external URLs, many hosted on compromised or disposable domains, points towards a phishing or credential harvesting scheme. The document likely leverages social engineering to achieve its goals, potentially leading to further malware installation or data exfiltration.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://alshaabcoop.com/userfiles/file/fowoxuzolas.pdf In PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/52223716047.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/dpa6hprqi3fdfe2elad12eaacj/65945924415.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210627103844621791.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/vefokufomezab.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5a181af24---fipipufilupagov.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/50112501944.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/nesitefoxul.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a3790e409348649069dfe9188647dcf5/1576205544.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/3d69eee88c2e5445cce9f09d4ac234c1/68749301922.pdfIn PDF document text
    • http://www.siposferenc.hu/html/kagelekokuxitizodagiti.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be5d2d0e7b---mosolo.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16080f59143a0f---fugizej.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/l85muvv9p5l00n93ouudpomm0r/17439965828.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092eb3d2cb71---30809203704.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/kthrv0fg7g4noea2m7jut7csg7/sagokirisiruredere.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210630120239.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/tqi73q196c6m7oo5spihj60ui5/sebarevavodeladanutaxez.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/bigijokegapaposel.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b27a09fe3f---kibepetotebonifi.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/3110919117.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/xawedisudinum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=convert+mov+to+mp4+online+free+no+limitPDF 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_off0000f322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF322 16896 bytes
SHA-256: baa9776487e61542494f73e080ee97dde745d66e623eadd287d8614c14a4a6c1
font_01_sfnt_off00011f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6C 10364 bytes
SHA-256: d6f1f1db1b1a1dccb8226b472a225bb68ba4a0e2a4d105736c8f210e7fed1094
font_02_sfnt_off000136dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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