Malicious PDF — malware analysis report

Static analysis result for SHA-256 8290adf728ffd94c…

MALICIOUS

PDF

87.1 KB Created: 2021-09-08 21:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9fbea9e877131ea8c0168dddac088f4d SHA-1: ba2eec77d342f85f9411f3554869d481041f5381 SHA-256: 8290adf728ffd94cea3e0cdfe76815ca4870674d831b5fe0f36191b3828f2edb
104 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a malicious document, including a high ML classifier score and multiple heuristics indicating it's part of a link farm on disposable hosting. The presence of a 'download button' lure further suggests a deceptive intent. The numerous embedded URLs point to a strategy of distributing malicious content or phishing for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=burger+king+gutscheine+pdf+2019+download PDF link annotation
    • http://toshiteriyakiburien.com/uploads/files/ponel.pdfIn PDF document text
    • http://qzgj.cn/upload/file/mikobene.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/lazibekakisedasuva.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/ad0761174bee3491dd1776b3676e04e2/tudabudiroj.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/4923399860.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/45221593681.pdfIn PDF document text
    • https://telorgabus.com/contents/files/33091249890.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/pujelixod.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/96144821272.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/sudomisarimavo.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/37844329738.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xolepowodevodabem.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/tetuvugaxebelowulis.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/bopejule.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/86222784909.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613736bc1fc36---zabalifiduronufo.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/ragutexu.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/pegusuvotagoserijuv.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/koxetekefixafokigemuwi.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613794bc4d9d3---gepoj.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/34176146413.pdfIn PDF document text
    • http://winso.tw/userfiles/file/sabomuxoxesutesezuzexag.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/jajuvugun.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/98337368133.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/runisos.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/86217277800.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_off0000e615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 11692 bytes
SHA-256: e27c74723b79a11ad094c86e7b9c9d3a04e21bceacdd4060dcde9451688346a4
font_01_sfnt_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EB 19680 bytes
SHA-256: 1693a5afef5b6d72163cea97c4dc5afa764d2261abbcf99c10a5959346c411ce

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