Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbe4198f68330a6…

MALICIOUS

PDF

89.6 KB Created: 2021-09-21 12:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 992a99f0b9466fca768f663de0d269a9 SHA-1: f15d0e986baa8c2035f25130f2e63d041cdad15a SHA-256: 8cbe4198f68330a627db5ffa13074a797d858a1cc546dca2e6b508d721abddb3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to various PDF files hosted on compromised WordPress sites and disposable domains. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate the download or execution of further payloads. The link farm, disguised with a lure for a game download, is designed to redirect users to these malicious PDF files, increasing the likelihood of infection.

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 http://brilliantsolarpaneling.com/userfiles/file/vedixegepegifisu.pdf In PDF document text
    • https://bloc-immo.com/images/riginawosid.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/relukibe.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac9b781539---geruvoruxadubusajelapew.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/55724340075.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/92284025375.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/fegazaberoxeximedakag.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/83570362728.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/568cffe44b83eaaf31a09b5866648b25/mijipitezodabunojuzuxas.pdfIn PDF document text
    • http://linyuepharm.com/upload/files/28346542359.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/wafari.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/nokovavixok.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/28736957379.pdfIn PDF document text
    • http://stroi-sistema.ru/img/2427611514.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/84907972667.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/l5ecqeqicgpiiqusj5vvniu6q2/xabudogaxixupidowutilaz.pdfIn PDF document text
    • http://nfc.soo.jp/file/moxipowagi.pdfIn PDF document text
    • https://steammining.com/userfiles/file/xuferuvebosogawezesovoru.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/kusoroguvizodesali.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/kajodam.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/95295bb82efb5a699cc41b3549f44d28/tomiparetakoxogekuzarate.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/68582618229.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/88a09dd3799186f973d074490360586c/pazakefamose.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/90504753232.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/lusojov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=fifa+street+2020+download+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_off0000f645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 18716 bytes
SHA-256: 155d0eccba3b19bbaee01f8d8ebe4e9936a160b5b815d4dd52cd8d2809bf6a38
font_01_sfnt_off000127af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AF 10652 bytes
SHA-256: 566f735b7e102bf9eafd63ab6ce336ba4cdb92a71361bb90f11448cf55985362
font_02_sfnt_off0001404c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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