Malicious PDF — malware analysis report

Static analysis result for SHA-256 df330d06d908eb2b…

MALICIOUS

PDF

87.1 KB Created: 2021-09-23 16:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c33ed9d1748b728ba5da15653ab477f9 SHA-1: 6478470fc2496c42d2e00a8edf680779a87b4415 SHA-256: df330d06d908eb2b220b4791bcc7f7aeb054dee55f49028292c8486160b08115
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external links, many pointing to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=hill+climb+2+hack+online+download PDF link annotation
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/babamirelaziwukibaf.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/77519520147.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/silubikuvir.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/76951157591.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613837f7dcc04---49802618852.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/suwisavirinirunelomexal.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613433ac29cca---donobogasawabovenek.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/75429338812.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/10d6581b9fb241817ddb8eab1a82ba90/joruxir.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/36676707876.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/5794927168.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/rejoduzogalavekixo.pdfIn PDF document text
    • http://zuche0551.com/upload/file/gapixides.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/gawuwebovupaforeregulu.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/59366476975.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/vovirug.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/40702344760.pdfIn PDF document text
    • https://arendic.cl/files/sevore.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/76757961934.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210918050110225723945bbr.pdfIn PDF document text
    • http://marketingnews.fr/images/file/lofelikakowofepatexetef.pdfIn PDF document text
    • https://semut73.com/contents/files/zasonazivagubo.pdfIn PDF document text
    • http://1carl.com/userfiles/file/kezumijoneji.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_off0000edf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 10696 bytes
SHA-256: 33a57e4ad9e9ec57d199fa1243dc61c021de730f21278f309ce45eccc201b8ae
font_01_sfnt_off00010651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10651 18416 bytes
SHA-256: e70fdb3c39e906e31cba63b96b586d0c78988435d14d31c4e641a7996ef6dc79
font_02_sfnt_off00013680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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