Malicious PDF — malware analysis report

Static analysis result for SHA-256 8784b0e3bc535d58…

MALICIOUS

PDF

85.1 KB Created: 2021-09-08 05:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a4ef62a2aa689c9cc3b9a3a08c70c9a SHA-1: 17a57fa4ebe3803177a6ed652c2262b755898b74 SHA-256: 8784b0e3bc535d589d2741b9178c6c4230ce54f9959c0d463aa644bdb435abfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, many of which are hosted on compromised WordPress installations. The presence of 'utm_term' parameters in some URLs suggests an attempt to disguise the malicious nature of the links as legitimate search traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=2000+nissan+frontier+repair+manual+pdf+free PDF link annotation
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804d347112d---93895573861.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fafa19d484---wovexuxuzegumaxejemu.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/77606416245.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161059e4150804---vakurawebuvewazaxeredela.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/36344892025.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/gesekokajulirobipetema.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4bbf35ead---12950991508.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/33108522316.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/2724661738.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/49188458954.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/matojutapavotatobe.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/85183868388.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072ab2de1441---87894517076.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9d59a5e78---13633080742.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/mimilukaguruji.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/subokifatikaxipof.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/04ae5b2d954c5028b467ad2e6d2af8a7/xunudiladifonadudepazawav.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210721072802.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b437a7ec0f0---25268218241.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/genujomatejavixikatiko.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/9272685556.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080ca79d0a24---32520147206.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/11351636920.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/rivebojefelipakubuxosan.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_off0000e6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 17964 bytes
SHA-256: ad3fadf4516c47ba9aed83d29b31dfeb1dc1aa600993be709ac29e9092978323
font_01_sfnt_off000114f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0B 10904 bytes
SHA-256: c0ed8d1d8e37b4b07a6be0a3d6c69ce7d72585516edf85e6c4b24f6dc3717d38

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