Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dcaa6f5a0805616…

MALICIOUS

PDF

90.3 KB Created: 2021-07-26 02:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 222d2de5b3544768d0e7dea5fe780415 SHA-1: 9bacef21814d9ee9148cc5a0910d9ebfbfe963d9 SHA-256: 4dcaa6f5a0805616c54539edebfe15860960aad54924569c8a66126413344c78
156 Risk Score

Malware Insights

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

This PDF file was identified 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 domains, some of which are hosted on compromised CMS uploads or disposable hosting. The primary goal appears to be redirecting users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/87b2e38bb4500a6c0bb16bcc6c8a92b9/59240286866.pdf In PDF document text
    • https://ismart99.net/upload/files/29486923054.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606e56e5d1b05---8262451945.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/majuzudusugokupurufuk.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/96595559872.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com//ckfinder/userfiles/files/lonimiwemile.pdfIn PDF document text
    • https://landi-bg.com/images/file/fuxupapolinifibavowirokip.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/66121176165.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b86c2a060bc2d6f7ed3b61f9e7dfaf21/5006746184.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2f8583bc3---23569449080.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d438a56f771ed4d480382efd1dd3f24c/mefuwilubelenijodun.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3aebd576cc---nafimebokesikagujofagiduz.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/d13ab45f336327a50d90c2b54d2f4298/96769420459.pdfIn PDF document text
    • http://fittbike.hu/files/file/lenopezagekesatifiwamaw.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/s0o0lp6npp351b7f6c7bnl57ko/41526267038.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608db4dadd2f9---48399643688.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/pjfv83v8l2ev88oko9n2c4gqdc/mebafajokapi.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/92162280917.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/wezexovewawitu.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/f37039a3b44aa934678700b57057c3ee/58658695321.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/48355936473.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739d21a0688---mawujoladuxe.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/00fa45824a34deec7187b0720b15cfc4/rurozuxutelawufopesinox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+quiet+onan+4000+generatorPDF 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_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 17344 bytes
SHA-256: d9def06ebeffba7837b679cba53d7f34d2d34520443abed623761ca401edbc85
font_01_sfnt_off00012a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14237 10592 bytes
SHA-256: e1b76459108a7207c345a5563679289294e708abf9cd653b41658bc4cfa533a2

Open this report in the interactive analyzer, or submit your own file for analysis.