Malicious PDF — malware analysis report

Static analysis result for SHA-256 71588a4744be1a9c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 10:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ff768ff24fd7fcaf61d77cff496f2a80 SHA-1: c10d5b32089477c4429184499174a591e5964147 SHA-256: 71588a4744be1a9cdfe69055e177a1a3454369545b43e2439b8178e7bdf3f5f8
104 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the presence of a link farm suggests an attempt to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pmrmhss.com/userfiles/file/robatinijajesora.pdf In PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/76225811908.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/63901536112.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c0f3fbb69dc8d248300b876a737e8645/62272030077.pdfIn PDF document text
    • http://wwsm-us.com/files/file/16906694275.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/31544789091.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/19227311581.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/wuzojeb.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/drsa9uetl4t9m9bh8a9kvnghm6/zozigojarezuniru.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/valunusexujewowuxuba.pdfIn PDF document text
    • http://parfumland.sk/upl/bajizajakajurolo.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/22804527034.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/foxakutikotaku.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/29054153324.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/65182998493.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/36657729669.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/84582533838.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/31616693336.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/24000794777.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a6f08dc7d---wosafetapot.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352267b76da---27513223423.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/91560094648.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396b8ea1a1d---fujofasamanamibimorib.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/bivojelizofupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+open+messenger+chat+headPDF 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_off0000dd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD68 17336 bytes
SHA-256: 1168c8fe5191efa7b66964383997ebee668c8de7ebb6b3aaa0368d8fa10c0b2c
font_01_sfnt_off00010a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A06 10900 bytes
SHA-256: 5c5b67e29ea7b5a9c0c92ece86a370945295c4dade51e1a17ab14682c57e0e44
font_02_sfnt_off000122ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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