Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a62ae16ecf857ad…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 07:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7aa263d8d739104a7711ca6f7e7c2428 SHA-1: 38112ba3e16085d7263f6b2bfda127a4ba29d834 SHA-256: 8a62ae16ecf857add0dff255f574437d0a887b4761d39c4a026b4e0658e92d65
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/11b9ed6ed958f56a5fbd9f69ff9886c6/dutekizudavesefox.pdf In PDF document text
    • http://diamant-x.sk/UserFiles/file/mupapo.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/rltjk0cqlmvarjm91c3745bblg/71902210876.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/a7d7a752d7ccb61bf73d6649b0e79e36/23729825346.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/svkcs7v2s8oqudhr35js6klv70/19671726589.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/webaminunidatevulu.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749f7f921c1---kijutonesuvediwibasaxi.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/kifabatukebidofupuw.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021072711015373499.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876a2f1cfd7---59884319487.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/43215742490.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021061805225411.pdfIn PDF document text
    • https://webrobogo.hu/kepek/75925106417.pdfIn PDF document text
    • http://foxhill101.com/userimages/46487826696.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/lujesijupikurib.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ed1e11de961ebb8e522bba18b2530932/tulemafijojesi.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/pajenebizapite.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/nakejal.pdfIn PDF document text
    • http://shs67classreunion.com/clients/b/bf/bf9552935413f2527bbee995f2dfc9b5/File/tudazatejiletesimapexowo.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/wuzonijebivotifelidaje.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/78381560440.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/vovodemuvuxog.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/monezawilurid.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/20394331262.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606e56e5d1b05---8262451945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=aukey+bluetooth+receiver+manualPDF 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_off0000dc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9D 10820 bytes
SHA-256: 77661f5bdb58a4bf8a7ef37d849e53e0fcf55eff4c8dc95bf3597fda7bc0c015
font_01_sfnt_off0000f575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D87 18236 bytes
SHA-256: c385a56f4fac5046f13a2d74463a947a21dc40107f5385b58c6bb3ea215ece6f

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