Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b991a2fc14970f…

MALICIOUS

PDF

72.5 KB Created: 2021-09-18 13:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fcaca126dac5fa51f83e066e9fb1cf67 SHA-1: 394bee708c54f754e28a4b30657fb90056c15f07 SHA-256: 27b991a2fc14970f10aa7ff4b0d058b69fa401eafb6cdf14ee164e4cf1a87b93
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting or compromised WordPress sites, suggesting a link farm designed to distribute further payloads or redirect to phishing sites. The presence of embedded JavaScript indicates potential for client-side exploitation or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://domario.ru/userfiles/file/55117665782.pdf In PDF document text
    • http://skulpt.in/admin/uploads/file/40375777014.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/nezetofujimibeseradakat.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614279a52fc10---30120733049.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/lakesarizilewaxik.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210918file///32731429788.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/90937993332.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/xitikirazapeziwusabirulo.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/87883224168.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/mowejewok.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/zamupudorovivunaki.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/gumupubibenebazisadid.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b133488b7---pazolugipisixa.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/rigovomuwesidewumajov.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/48616862872.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/56634921621.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109021809092485.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210908_A44D64BE51DB1AFB.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/55bdccfa8c2011af21be6c5b9db21568/2190148500.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/8567582450.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/toboravosom.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/mixerugomidibizipozu.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/zaxodiwubume.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/91296360737.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/81466540590.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pakavorur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=mod+apk+avakin+life+2021PDF 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_off0000b9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EC 16384 bytes
SHA-256: 5dafc034b828ee4f775e43805d8379ac51ece46c11af91e41c446666238ee928
font_01_sfnt_off0000e3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FF 10568 bytes
SHA-256: d834d9851a85b18291680c55325ef1e78bf01c14c255eef6bdab3187bfa0271f
font_02_sfnt_off0000fc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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