Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7619e559ebe9893…

MALICIOUS

PDF

72.9 KB Created: 2021-09-06 00:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0ce63179e76a343bc678e2375a16731f SHA-1: 8e96a7a2e2043664ffbd36d5385b312fce09c976 SHA-256: a7619e559ebe9893e0525f707dbec84bf7e36897f061713c5300432d2d2160e7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier strongly indicated maliciousness, and the overall structure suggests the document is designed to redirect users to potentially malicious content or for SEO spam purposes. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://stdtekstil.com/upload/ckfinder/files/tovuwaketifevibeg.pdf In PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/63a8a8230ab9b127fa1db523bb9b5711/95653378072.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/v29kcmnbr8n6a52f6c4m7mbqb3/liravevasusuv.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/d09855722f89dfbd92ee2b2d5899dab0/55405922436.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16096d8fb3ac65---porige.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/laziguxarifi.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/kisuxegoginusaxopataxeji.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/59549472582.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16127bc2abdd8f---zejepapifowodofe.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/9f2ei857skl58dlo85s4tbtcv0/11223682372.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/37149475468.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/c5dbc7b76cd951b65d78b8b01751f0bd/dadomudetejovejowog.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/dc514a0f517ab33558398683e6027625/safeduxusabojoxopakasoza.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/girovamere.pdfIn PDF document text
    • http://packamate.com/userfiles/vizixixapus.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf0e190fa3---vomowafezulamuguvijoti.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/xaxolakodilivozavinof.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/kedevimetodoxedeje.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160813faeefc91---2833327525.pdfIn PDF document text
    • http://doer-sh.com/Uploadfiles/files/26708303595.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608309ec737ab---53600599968.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/vogarivurekid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=suma+y+resta+de+monomios+ejercicios+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161041f5c11b75---75762951623.pdfIn PDF document text
    • 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_off0000bbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E5 11152 bytes
SHA-256: f7f1615825abff5fb652aad20f56b244749c6de85cc8a76be2ad6688303f2a92
font_02_sfnt_off0000edef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 15840 bytes
SHA-256: d9898718a1b0d799f633f7bf1c43d708194aa3ac30119a18df19be655eef4ee4

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