Malicious PDF — malware analysis report

Static analysis result for SHA-256 87acf0e6ff7b5b5b…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 02:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7b79479c0b1ff5da0677a85b7947fdd5 SHA-1: 80c4365922c0c59f389c0a435f528af189307412 SHA-256: 87acf0e6ff7b5b5bfb6775cd46f8b1840b85c431963315d2288c5850362d5154
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external websites, some of which are hosted on compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the URL with 'utm_term=minecraft+apk+update' suggest a lure to trick users into visiting malicious sites. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://medvor.ru/uplcv?utm_term=minecraft+apk+update PDF link annotation
    • https://sakesushimn.com/userfiles/files/xobukexenizurasidadavasu.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/i7mmgo5e0bqsfirqf6q4rljmbk/gatodidosulanimufopeduguv.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/84320176747.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/76010762371.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/rakenaxovakov.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/17384470719.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ab7f63e6044f4aff28e69d5880027a9/55848465148.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/79486678747.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/tudadadeki.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/lebizegupagajagal.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/vajutogunage.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/89874457411.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/52201447167.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cefd745cf---95421477663.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/32898499742.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/xepili.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/n859gqbqe2acgjera57lguv4l1/48104428636.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/duwavuvonaru.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/13104501596.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/90457585256.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/31810672289.pdfIn PDF document text
    • http://mobilenmr.com/files/files/sajixiremekelug.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc631da4f0---gudevajozomajejek.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_off0000b14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14F 14648 bytes
SHA-256: bf871434abd12fe44b56136caae0632d55145bfa930b103c979ee28b344da356
font_01_sfnt_off0000d67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67B 10464 bytes
SHA-256: 6eb7622e046a58ea8bf9193d880655f20a093c45224caeed63c0aeff06f7886a
font_02_sfnt_off0000ee5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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