Malicious PDF — malware analysis report

Static analysis result for SHA-256 8530372c5b2484e5…

MALICIOUS

PDF

83.6 KB Created: 2021-09-15 19:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 23bd4ec0b2958bf0440c36b7b9811a12 SHA-1: d31431d0b00aeb0cd87351f770dfdc31dc85b34a SHA-256: 8530372c5b2484e5932a283e84b002039fd35bfc76546334829b7f9ca63da010
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=portion+of+electromagnetic+spectrum PDF link annotation
    • http://biomax.shop/filespath/files/20210911081319.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109011813593147.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/50379546819.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/fodofoferisejebofoxomagif.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/39313882855.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5fd779622---42439024021.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd4968d60---32613689865.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/90979027813.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140f00dd1a23---30668246182.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/81539005029.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/23978226799.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/funupafawalurav.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/14752544477.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/41639016729.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/92087336175.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/zowolano.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/sazefenisafave.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/22487940147.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/63980898262.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/23892843922.pdfIn PDF document text
    • http://egitara.com/upfiles/files/56640393489.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/59482961292.pdfIn PDF document text
    • https://subded.org/userfiles/file/28577267538.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/lobigelo.pdfIn PDF document text
    • http://artio.pl/files/files/vusewurubijefezuk.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_off0000e009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE009 10924 bytes
SHA-256: ac8dd329a753ea88e69cdba7223fc9030659ec91256739d5444b6b8bbab220b7
font_01_sfnt_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 18100 bytes
SHA-256: 80cd35fae22245dd8e0d3c89215182e7ceb12ac8d08bc0b2a718addd975e16ea
font_02_sfnt_off00012891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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