Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d6b3eb7b880d79…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 21:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d209d0bb9ac92944629a2d0a32bc80e5 SHA-1: 9076d8f7c4d5847ded5261ab4216964d751428b8 SHA-256: b1d6b3eb7b880d799c552321630575eff9e8cfd8f15bff659f745c0909daffd9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, pointing to multiple external URLs, some of which are hosted on compromised WordPress sites. These factors, combined with a high ML score and ClamAV detection, strongly indicate a malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f3e6fbc36981bba60ff3501c5820ac36/33509460014.pdf In PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/2da6d4600e86ddd9634abb322c963c63/24233014451.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210908235759.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/pubexine.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/rosow.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/korofupixowatemuret.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/22528011774.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/nujofudizo.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/nobikimaxife.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/wedobopedulu.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/27720033633.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/supulekikutokebozokir.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/13558050965.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/61484287180.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/74171229852.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/35264901093.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/12859122627.pdfIn PDF document text
    • http://wdnederland.nl/file/86285262347.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/68786240171.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/mamifujarabegumagal.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/sokusuxatanafa.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/robotelomoxuzoziponed.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/gosanuvebitor.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/4176914257.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613b51cb10e1f---basilutivurugawupu.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/4993198628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=text+and+call+blocker+app+for+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_off0000d592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD592 17672 bytes
SHA-256: 551669bcb9a9495223504faebc5c264dcaca081cc97c42b97770e1ea46fd4e12
font_01_sfnt_off00010314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2B 10744 bytes
SHA-256: c583e45d47e954cbe0ea26c44a38e55b7bdade7287fed681af23694fd4e54ca9