Malicious PDF — malware analysis report

Static analysis result for SHA-256 b191729e582c8ccc…

MALICIOUS

PDF

86.3 KB Created: 2021-09-19 07:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b587a09d69e4e214766896c930758486 SHA-1: e35feee02df3bdaf25afc4efbaca9a0b5a799523 SHA-256: b191729e582c8ccc1d68af918cdc700fab618782920b4f2573f51cf3d3bbed7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external URIs and link farms pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The file's structure and content suggest it's designed to lure users into clicking links that lead to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://pistant.ru/uplcv?utm_term=gamer+android+apps PDF link annotation
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/buvejinonerepomelowaz.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/titunumi.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/40040743017.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/15142702329.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///faviselajuzekezirod.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16143eb4006423---tubosasoz.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/9339201831.pdfIn PDF document text
    • http://agama-rc.com/upload/files/gudokefawovolopirora.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/7uhc1so7v5e3rf6prhv65704m0/90829185564.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/xogilima.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146766d8f669---rukibujosovilonenajizup.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e47jalo3l4283gdau7rhk1su77/davugeg.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/42929489316.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/24u0g8af3pi2h3q83mnkclpm41/tumamagidebiko.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146b2f1d2bb5---sukujuxuxusoja.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/15477106736144ca2ddea3f.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/22917548186.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/a656b61692b909d1d924a2240e8b3ab3/wufedefone.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365c4a7819b---37022557240.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/5c3794f7a5f34b9138128041c829d0a3/varamunu.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff07112bee---muwawizumeneruno.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/84245212325.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/migad.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_off0000ee9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 17640 bytes
SHA-256: e1c11ce5330eb5fead2a1ff46fb1ac42e36634b9aa5e97f80354bca35f964940
font_01_sfnt_off00011c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B1 10448 bytes
SHA-256: 45f98d3e976a316c5914b455c11de2cb95e58e8216f389cda1fe262614689846

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