Malicious PDF — malware analysis report

Static analysis result for SHA-256 733068ad1b47cfad…

MALICIOUS

PDF

82.1 KB Created: 2021-09-02 12:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 275a4e2dd958531d62cae5d4bdd3984b SHA-1: 37fd2b3f48cf2d4a6058a2413485cf69627c6e73 SHA-256: 733068ad1b47cfad39d6d4688ddfb4d5ee6dcd46c216b7951a7e9598c17e5e06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to other sites. ClamAV detection and ML classification confirm its malicious nature, likely for phishing or malware delivery. The presence of embedded URLs suggests an attempt to leverage JavaScript for malicious actions, such as downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=only+you+yazoo+piano+pdf PDF link annotation
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/nsnh0ndnih9nkgkm677i2q85cs/sojuwibukuron.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a486ca852a7---67898892457.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d35ec8a6f6c---5716868674.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/pinejesu.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/dixosixiwaladuvevere.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e486fab5b1---luzijusaxosikud.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608561d3743e8---wafenaluf.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7926c74fab---46382050262.pdfIn PDF document text
    • http://slpclassof67.com/clients/45391/File/dijif.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/67531902804.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/wirixekimowepamemile.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/89367903942.pdfIn PDF document text
    • https://telorgabus.com/contents//files/kukakibur.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/xiwemozufazosimubovasusu.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/mawimexatafoxi.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/vamuwujagavokefi.pdfIn PDF document text
    • http://fsanaq.com/upload/file/21070418021177337693kv3k4n3gg6.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/sevilipakinebata.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/mivad.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/jgb88p4548r0abkstag8lo3fat/9128721489.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ec17f311f---10712778115.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/29793915123.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/fotefozewupusifuren.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/41896636570.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_off0000dce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE6 18088 bytes
SHA-256: 54201beb84c2bce30173f68953c297ee86a967be9b76f1506f0725f0a0edecfb
font_01_sfnt_off00010b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A8 10292 bytes
SHA-256: a13f8b9a314f0841706fb26f9993e66b25d5baab76bba01c0b2137c8bdc0de1c

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