Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b989911c3682b76…

MALICIOUS

PDF

74.0 KB Created: 2021-09-14 07:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a8ecdfde55a5530039b76d0dfcc6cec SHA-1: 0de56fb50a835fc4672ef36f3c028a2166235d73 SHA-256: 1b989911c3682b76a600615527caf7204912aaed8736de26c77c205f9735d344
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites hosted on disposable domains. These links are likely intended to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130348701646---zoxidon.pdf In PDF document text
    • http://www.jindatunnel.com/up_files/file/zozubewixazalilif.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/99125598967.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/49806058621.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/jerigelumatalima.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/45350914176.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/duwoxuxif.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/89291419642.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210914062804.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/94316491739.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/nabujonofepojiwodivow.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/35999775582.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/bamafuderebejanusexili.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/sozezeme.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/f368fe6552ef0a837eca960a61656354/mivikuravawefoketu.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/kiwimejevakipebudazup.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/polevixukoxinujun.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109011743098148.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/6490a0266c100b3dbf5839943b67fea8/tarovazobiwasokiz.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/67333456471.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/pisakevero.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/93912392992.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/27478569871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=miui+11+androidPDF link annotation
    • 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_off0000c016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD828 17384 bytes
SHA-256: ccb1a215cdc5b5f1ad4c503f5fc91d70c4f28158575a50d70d86c6f6c64f0aa3
font_02_sfnt_off000104e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 9940 bytes
SHA-256: e086aced1036d9e0c5025a519500c272cecee37cc2e06727a0cd95b8da40c7c4