Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa2d9511fd8eda4…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 21:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d69039abd5c14ce6845e3cab15ef0138 SHA-1: b3a002b700b1aa8e30e9414155003e1f719ce3c4 SHA-256: 7aa2d9511fd8eda4deb05a54d0d02c0e75d68ab6311ec5ae2c6758cbbeca1f9b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, forming a link farm. This suggests the document's primary purpose is to redirect users to external sites, likely for phishing or to download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://coretry.ru/uplcv?utm_term=single+player+strategy+games+for+android PDF link annotation
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16147fc215989d---42776148298.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/tofudoguvadidusirixim.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/sodapir.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/94280685434.pdfIn PDF document text
    • https://kvzriu.org/images/file/pekajumenakiwisobe.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8c5465517---sagobek.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/wimibetugenumegizineja.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/vexezimutebumemosijikiraf.pdfIn PDF document text
    • http://halaljones.com/uploads/files/9313374984.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390d63dc197---55710501657.pdfIn PDF document text
    • http://timebymtm.com/upload/files/guwejebiteribopuxelo.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/janorupafuwizuxewogolus.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/21605265275.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/livuv.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/39301968878.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/83372834281.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/zabavo.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210901112333.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/rovule.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/78404016526.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_off0000ad5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD5A 11032 bytes
SHA-256: 232062d9afed8c8ab0c99b6a166694ab11df6a8f3aa2ab9bffa688ef8ccf86a3
font_01_sfnt_off0000c6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE0 17848 bytes
SHA-256: 55baae27e7dcfd40efb820d77077a468f9e1a6b00f029091899f23bbdbd2a763