Malicious PDF — malware analysis report

Static analysis result for SHA-256 7944ad985f2ff484…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 07:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1161b9f80d052f2dbdfaab04a4aef8b0 SHA-1: 978aa11e5d5534c349bdf303547bc12ab18203bf SHA-256: 7944ad985f2ff484f7abdd3ebcd63432d8f24dfef223cd347a59c004d6151adc
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, and the document body was unreadable, but the link farm structure is a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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.
  • 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://mutitar.com/user_img/files/pewijefoxuparodogemefatew.pdf In PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/84846881979.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/55329686280.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/kivuju.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092aa222d852---defexirukatuwunekuv.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/majenoz.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/romisuvoxulemovusabe.pdfIn PDF document text
    • http://zenithmetals.com/files/68422463809.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/24958997366.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/ad534c3eb80a8ed61a8858508c1cb2b7/62486680201.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e98db79f8---63078981163.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8cd5f11d---97839443139.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/pikuwemajizebas.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160982f2882679---ribusuzojesujisip.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/11809020988.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/9ivo6nbhtrgo8defa03501mruo/ditana.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/71259457926.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/ca024208163aba6a9fb2fa343d1a7ce1/74459530481.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210720144423.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/xusodebuk.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/kepizipulewubunizemunibob.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f7fc6c309---68876494983.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/48823313274.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/80777077176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=it%27s+a+sin+to+kill+a+mockingbird+quote+meaningPDF 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_off0000da9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 17776 bytes
SHA-256: fc1338c16adf9e0d39399b812cf79a4cf269927d00efce0e3d57a407d44e9932
font_02_sfnt_off00012105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12105 11176 bytes
SHA-256: 09fc608f368f7abfe6aee5e2d4c4543b64543d69fe5a881877f133aca5a066b4

Open this report in the interactive analyzer, or submit your own file for analysis.