Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc931f7f935f552…

MALICIOUS

PDF

77.0 KB Created: 2021-09-07 12:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0374f3c17c2f1e8c57a6818de932c65f SHA-1: 0de64847552e90177bd847fb3f2407847443fb3a SHA-256: 5dc931f7f935f55241fa5d23935661acad393140cd88e7905e771aa40be14fb4
196 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous links to external websites, many of which appear to be part of a link farm hosted on compromised or disposable domains. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document likely instructs the user to install or connect with a remote support tool, a common tactic for social engineering. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading and executing further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://infrive.ru/uplcv?utm_term=options+strategic+investment+pdf PDF link annotation
    • https://genia-groupe.fr/images/files/91475163489.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2614311083---zurekojufuguzufirupi.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/33651069331.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/mh13srq3rjuk8k5hf5snec9f78/10538479020.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/17769405943.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/ag9guvfis49l496pmsamv06ig6/witatuginujukesiz.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a62ff4f3e1dd2a35af1bcb76b6edbb95/44848004722.pdfIn PDF document text
    • http://signauction.net/userfiles/file/43707961290.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/63b9a916e152b8615b13c01ad72745f0/nujudisizob.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/37499172338.pdfIn PDF document text
    • http://metapolar.hu/tmp/2858419569.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/77579288653.pdfIn PDF document text
    • http://apple888.vn/luutru/files/joduzajanokebopezokipumib.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210508221831151.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe19f0eae5---86449636481.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607324e9b868a---rewarewakire.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf676c33c3---52433218806.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/4d4e90ede102d74e11d013f18778b528/jetolevazomefeselawuvu.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-8-22/20210822171407175507.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/48188963660.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/64346323927.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/wezowunevasasasefo.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/rufasanujuvumefigur.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B4 11008 bytes
SHA-256: 0d765740c50174c1aeafc101f9bca914c78b742a455a500226d606943cd532d3
font_02_sfnt_off0000fc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC28 16708 bytes
SHA-256: d0559c3dbb3876814e30ba69016ddb20cb72e4661357d92367d96c1e5558f542

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