Malicious PDF — malware analysis report

Static analysis result for SHA-256 d30fd76e6cc68506…

MALICIOUS

PDF

73.4 KB Created: 2021-08-30 08:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3f8c1a221a48532aa8851a5dbe1232f3 SHA-1: 4cf6390b3a0df9edd934e2055e3c07d562352755 SHA-256: d30fd76e6cc68506ae460ff3c26dc268101052b7dda48e41e7c26af97cdcac74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm patterns, indicating its purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of compromised CMS upload links further supports the malicious nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://inwebjor.ru/uplcv?utm_term=list+of+odd+numbers+from+1+to+100 PDF link annotation
    • http://sevimticaret.net/userfiles/file/bumumaf.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b404bdcbac2---dabagolimorok.pdfIn PDF document text
    • http://whatdwellswithin.com/file/rokazi.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/guzetenosajopuf.pdfIn PDF document text
    • https://orangerun.re/photo/files/lavuzodovojesi.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a73775e4f73---61638201194.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/zidonowejabipit.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747d472f0da---kigijalisiran.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c4644706a---kajelepopi.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/geloselebebixegafukesesu.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/18262049304.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/vifigedezagenonebuzo.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/taroxuvisarewu.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/80795246124.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073f5634f5df---foxedaladamu.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/9179727716.pdfIn PDF document text
    • http://momsystem.ru/public/file/tokovamunupi.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a02d10aa---91131339433.pdfIn PDF document text
    • http://alcantara.cz/data/file/sorasamuxabuwas.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8753796578.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/afa48cf47958582c37e18e3d9d603165/wudelor.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e86ba18471---fomekesodebe.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc5ebb7ac9---tujigibed.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5949q840uo59r8bluadl6b8k4l/fekoxinu.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/tufowetaxavif.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_off0000bf27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF27 10676 bytes
SHA-256: 46a7dd574fbe20b82e7bbad0bae867e71320bd97db0949dfacf26f7f47409f79
font_01_sfnt_off0000d7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A2 15624 bytes
SHA-256: 1507f1e05866636e0d3934449815b9386a998fe9271331ef1a17b5e658772127
font_02_sfnt_off0000ff6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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