Malicious PDF — malware analysis report

Static analysis result for SHA-256 a466fef21efd1f5b…

MALICIOUS

PDF

117.5 KB Created: 2021-09-01 09:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2238e08053e6d5282fbbf9467d6184b1 SHA-1: 6d067d907861a9c0eb5652743bd069ec98c3812c SHA-256: a466fef21efd1f5b26c979e6a72057dbbb043794f98a318c726ae89bec1341b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of external URIs and link farm patterns suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=elaborate+on+this PDF link annotation
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fd79d5d992a---garulavagaror.pdfIn PDF document text
    • http://royalgroup.at/tmp/mewijujuw.pdfIn PDF document text
    • http://clingac.es/d/files/jokefimogiri.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/lelavakedixatatukagij.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/skg3bmha317c75p3p83va0ut5m/49999188279.pdfIn PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/kurivogunidimi.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/gifiga.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/18717071703.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcee44707ef---42326305759.pdfIn PDF document text
    • http://ipllaser.in/uploads/lunuturatajugifuginef.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210722_145102.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/vofb2qmdb1u2fqsi7agbk52au0/ratikabo.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/xibewokejawebip.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/fomorudapufivorazamofajol.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/futobipivimatafegabeko.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/87757556712.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bbf4518fb5---zojozazokikojepal.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o587loli8mlajtl7fe1c9cnm32/fonazowukuma.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/68906284278.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/15175880773.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16126a2ba3e30e---11695159290.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/dutusijikimeno.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab661e83cdd---87899031651.pdfIn PDF document text
    • http://simpelms.nl/userfiles//files/5075369797.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090111184544.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/60938917067.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_off0001695d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1695D 18624 bytes
SHA-256: 4b3d42eb339ac3acf7d6fc3831914e002ed796f066f8b5cf8c17af5b44d52c0d
font_01_sfnt_off000199b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1CE 10328 bytes
SHA-256: 679882cd915100411f6410bf2b09bda58e2d7fd39050904d67a54335423420f5

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