Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9c0054b04f3a70…

MALICIOUS

PDF

71.0 KB Created: 2021-09-11 16:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 550f628d6303472926b9215f2786b6cd SHA-1: f6e69a5cd0cad9733c3d2c8d217a08185967946a SHA-256: 1b9c0054b04f3a70e0284b2a7d95c37755e61c651689df3ddecbd4306c3f8037
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution through a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16136ddafbeb58---fotewotesebutebarekajelu.pdf In PDF document text
    • http://chieucoingason.vn/files/52666829071.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/455460248b06c842b83f868986e27e42/23118904651.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/xarelodara.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/sisapeve.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/83249696737.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134809954148---55394460864.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3053f2d8d---bagowekuwug.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/a1570a5007c35881ba15d9b1ca771886/62702213558.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210902_C0E36DE1F40A64FC.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c3cd93677---67902358634.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/vfsu874gjoj8e9f76uph5f76hs/vilerukoxuz.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/xusuterumuj.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/jixukurogotesoxigujo.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/kafipumezunusanikuxoka.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/lerivexisepi.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/30667865054.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xelopove.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/wedigurakawoguvisu.pdfIn PDF document text
    • https://ijp2.com/contents/files/16236327187.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/fekurumakirosa.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/bifopebatepugup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=jordan+peterson+12+rules+of+life+pdfPDF 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_off0000b4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD00 10756 bytes
SHA-256: 0eb167258765647a8f8cbbc85530c99ae95337c967ba116c711b5b9821d6866e
font_02_sfnt_off0000e5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 15952 bytes
SHA-256: fad833cba7598c02a602124303aac3eee78a4d0666e719eda9b05ebb6f61c3e6

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