Malicious PDF — malware analysis report

Static analysis result for SHA-256 06cd40f0bccf8e18…

MALICIOUS

PDF

80.4 KB Created: 2021-09-10 08:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1bd334b457a97717e6c79f86e9d47887 SHA-1: 7e9786e92168ede6e4cd706537ad17f6bfbd297d SHA-256: 06cd40f0bccf8e18ad367140f1f1d33306e90dbfb3a03c7accab4d5ce68719c5
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites and disposable hosting. These links form a link farm, likely intended to redirect users to malicious content or downloads. The ML classifier strongly indicates maliciousness, supporting the attack pattern of luring users via deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://tekizolasyon.com/ckfinder/userfiles/files/sutifemijubapebifu.pdf In PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139413356a7c---tumiwidokedubotibejiforod.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eea5f1f6ee---tegugelusape.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/xexivejatomavus.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/niwaloxirojok.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abea6efc76---jivoworufekite.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/ziminunotijufewi.pdfIn PDF document text
    • https://protum.se/file/katatod.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/57989554173.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/56919135277.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/26426296080.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/jejexowabodudufijawuzaz.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/boxuvurigewibaribo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/92045ed6o5mvhno2stiuhr5ob9/kisifugajarida.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae402a2335---5037440843.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394b781963c---8773714521.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/33531736196.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/bawewimodu.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/rejiwepirutesosegilowosi.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/47913859416.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/patewobifeta.pdfIn PDF document text
    • https://petek.biz/resimler/files/tavowamuxudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ilauncher+apk+ios+11PDF 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_off0000cd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 10568 bytes
SHA-256: 34c4ea32752b4b8f05692acabe944b52d544b3ae082ccb77913f5b2d1cceae19
font_02_sfnt_off0000fd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD40 21084 bytes
SHA-256: 1109a9cdc76084f1926f66b1e2785826c69cb93e15901d84ac5f95bfdfd197b0