Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fbb0ca99d81499d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 06:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf3b7c7efb84c1de6869e18571459ad4 SHA-1: 1d540645f1a593cc9db7e664ae0f3ac66f62db74 SHA-256: 6fbb0ca99d81499d4185531b4a885bb788c66edeca4a5b1b040396cce4144354
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms or compromised websites, suggesting an attempt to distribute or host malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://nomylo.ru/uplcv?utm_term=introduction+to+management+science+hillier+6th+edition+pdf PDF link annotation
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/22037906488.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc1e52144f---20170382988.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/20849413385.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/redobaba.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/57927606671.pdfIn PDF document text
    • http://ropesadventure.com/d/files/4360918804.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/wusivipemexuvariwugetul.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ef8b8b0cd---52637221989.pdfIn PDF document text
    • http://dyweisheng.com/uploadfile/file/2021072510472773499.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/ef2bcc253b584a411677df704f782784/46903583327.pdfIn PDF document text
    • http://lg-palette.com/upload/files/35800840266.pdfIn PDF document text
    • http://prosquash.by/data/7732393003.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/jumeworanapigedeni.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/jakunodekebu.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cccf64c23d---62576257105.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/rigowusegebonejowuwokal.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/roneloxazoz.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab8045a140---domisunirujowebevowaba.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/54658578939.pdfIn PDF document text
    • https://sitarasign.ir/data/file/33413633209.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/004dc46bd64d4aa40d5fb871a1001357/6101003286.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210718092317.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5a6fcd721---87530553294.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/wirakugedibasobisa.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa159ce33ec---rosunaju.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/45871784925.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/rikizavajuzozizibatot.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_off0000d5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F8 20652 bytes
SHA-256: 70d59c4eb8af1841bc40e8b96f6294a87428ad69bfae1598844e13f0ec66952e
font_01_sfnt_off00010c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001248f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248F 11284 bytes
SHA-256: 5c4ecf1127007c7d074dfaa99322224a08fbd2cd8c6896bdccf9d092726b9e9d

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