Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e7e9321f617274…

MALICIOUS

PDF

81.0 KB Created: 2021-09-23 05:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 32a209d58520450506658a8279e5f3a8 SHA-1: d8c5408952be9777cb8a6ac6a2af07adbc1a5ec9 SHA-256: f5e7e9321f617274c4707d2f4993724c457756e7cb11bb416bd4328f750c8afd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with critical heuristics indicating a phishing or trojan threat. It contains embedded JavaScript and a significant number of external URIs, many of which point to link farms on potentially compromised or disposable hosting. The embedded JavaScript likely facilitates the redirection or further payload delivery, while the link farm aims to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://inwebjor.ru/uplcv?utm_term=queen+%26+slim+full+movie+online+free PDF link annotation
    • https://classoft.ro/userfiles/file/dikezepap.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/70815442510.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/xudaburi.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/tabomenijiwavubumomulan.pdfIn PDF document text
    • http://derivat.sk/files/49679776742.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/zuvulew.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16134d2d98e295---14803957593.pdfIn PDF document text
    • http://ukrfirework.com/images/file/8384771527.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/gopanelasebarebidezenit.pdfIn PDF document text
    • https://auto826.com/uploads/files/97501773129.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/zunokapuwetuwuz.pdfIn PDF document text
    • https://theipbuzz.com/images/file/fowopebik.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/71787955991.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/9150062551.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/maputonimefizesekutuv.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/51305240404.pdfIn PDF document text
    • https://krossi.ru/images/content/files/sitomitojipumodekidabonid.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/sejupupoz.pdfIn PDF document text
    • http://stroi-sistema.ru/img/40154938754.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/e9833edc18dd012d09abc62a3eb77f98/90424760672.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/981b016b9bd0a00be122af4665243344/67728300534.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/67085125129.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_off0000d86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 9468 bytes
SHA-256: 1e0426e6f467fc528f658d47313ed8b41e5758bfe0cc8ca6262a752eb1d7f20e
font_02_sfnt_off000104ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 18916 bytes
SHA-256: 5aa8330c271a6f55168d1fe9106420acb12ae3e967067e11c43b09b969834c2a