Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8dfe6cb54db58bb…

MALICIOUS

PDF

83.5 KB Created: 2021-09-05 12:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ff8687ba8d438a377f87baacb36d0728 SHA-1: 00584c008f68f41586d2e70aaf0de72406ec1954 SHA-256: b8dfe6cb54db58bb1cf14cea2fb69da4bcaff9375cc8828e7085a09ea0a548e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=daftar+pustaka+yang+benar+pdf PDF link annotation
    • http://prabashproperties.com/ckfinder/userfiles/files/lesaxilipalubakugafisedod.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/82314948796.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/54687850228.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/14506717590.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/fbpqccsqmk4csqhflku9b6i7aq/79059122571.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/vugofajisopukokaw.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/58cbf77cbbc79cf33029055c47764926/fekuwisevogetagoxumikomem.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/66520286261.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/rakur.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a276132443---zatedisal.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/fogibomazugoduzelovaj.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/butazejolukawadoraxa.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/81093213797.pdfIn PDF document text
    • http://mextro.de/upload/files/pizurimovone.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/89089870562.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/xeregixebu.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/94812023960.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/bd73c98a0693d2eba0a50fac8bdee3cb/fugateronojumodebipaw.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb03cd378c---61899148605.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/tipesekovukevigulo.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a33e3c0da11---42715248295.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/mazosofotafuwikokoleguka.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/bezif.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/lasajototevebomavisi.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/lujojamonutirujare.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_off0000e266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE266 10860 bytes
SHA-256: 4caf1a73ee3f5adf8ced4ea5aa0d91d72622203f683049185a3fab17d3b5a711
font_01_sfnt_off0000fb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB40 16992 bytes
SHA-256: 722580b291f12ae589aa73273a4bffc0de3151183575c5bc099ae5ce85d004db
font_02_sfnt_off00012813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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