Malicious PDF — malware analysis report

Static analysis result for SHA-256 414fa6e3b952b185…

MALICIOUS

PDF

79.7 KB Created: 2021-09-06 03:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c7c8b0da790903e6df0279535748c7a3 SHA-1: ca433c4a46847c5cf1458f30b7703c051e63adaf SHA-256: 414fa6e3b952b185629456b1355de805a944e3867d6564c1c342d342c0f4ba57
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the structure and URL patterns suggest this document acts as a link farm, likely to redirect users to malicious sites or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cff035e0a5---mixesodojefet.pdf In PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2ddbbc87bfd1f1dfee0d513045f56ac8/nalor.pdfIn PDF document text
    • https://superpart.com/files/gixiros.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/luvosipemopademom.pdfIn PDF document text
    • http://intersonik.eu/upload/files/89619274232.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/6cedl0csl0lfilbn1l9ojiss95/kavep.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/bar5msi3boisj4j4ae8fvkm777/93254053598.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021080700034073499.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/13ff4ef8182fc5e87faa139f19fbe496/44202029854.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/sobas.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/15749657182.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cad3bdce9---7724626461.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/6bcf6ed25f719040557cb2ff08971083/79803912978.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/11666859944.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/m9m51pggl5ug8j3je50fd7nsk4/34121992715.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607343f8a80bc---gubevasoj.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/47947577932.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609a378942262---nufuxan.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/lenedadatevomidasodu.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160987a4da3388---14941382720.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/85bf624f651aa0fff2633fea2c38df0b/57625870264.pdfIn PDF document text
    • http://dentherapia.hu/files/file/14930490128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pan+edit+application+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_off0000d44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 17736 bytes
SHA-256: cd0bfef83f51a507595c9ae71c91ba45be40efb92c44d8615a9e4229ac273dcc
font_02_sfnt_off00011a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0E 10348 bytes
SHA-256: 1608e3bac76950769d022c082820762beed6ee49d27b3ecda5966886d1ab17dc