Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c5b13fd00a4389…

MALICIOUS

PDF

71.4 KB Created: 2021-09-18 01:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 87880a529c8d2022e9bda34501e4f73c SHA-1: 337240e6d3f017bb5a8fc363f7b5ea37f41a36b3 SHA-256: 10c5b13fd00a4389d03b2d2a482c60627e9cbd354aa32d76166506e8e99f725d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF sample was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains an embedded JavaScript stream and a large number of external URIs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. These elements suggest the PDF is designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=how+to+update+android+on+xiaomi PDF link annotation
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/mugujijamakezuxabebom.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/tokufifedobezubibubuk.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/96038709938.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/53875968533.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140ab7a00b17---27129420733.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/72032802848.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/75658454879.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/zenitanetedobajoxa.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380bc86eb51---xotelif.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/36180875.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/8124772692.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eef6fe7b40---65796832706.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/rogizetunifokizipijokisa.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/10410944934.pdfIn PDF document text
    • http://sun-tes.ru/files/file/suxamelavetodugujozavevuv.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/39974725054.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210911131241.pdfIn PDF document text
    • http://sayarbobinaj.com/file/22086367479.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/86738658484.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/botisupejopugulalajafinit.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/jazivinikerederagamef.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_off0000b5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B6 16388 bytes
SHA-256: f65efa03dfcffce045d1a43a79ea7e5b5ce4201accd7038a0fe41459dbbffaf2
font_01_sfnt_off0000e01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01E 10620 bytes
SHA-256: 45bea8ecf0c247dc23edef24b39c389992b3e377b654b8ced8b1a6594d2c9271
font_02_sfnt_off0000f85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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