Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e6657e166d580a0…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 19:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f95acc138644d0609206e923fbc06b6b SHA-1: 28c97b199bb2f086bf6b2161eeb0b8b92571c60c SHA-256: 0e6657e166d580a0655d31efffdae8c44e32c5bc9bfa285aec6eec2b27719c0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ketchas.ru/uplcv?utm_term=the+screwfly+solution+pdf PDF link annotation
    • http://dulwichtaxi.com/survey/userfiles/files/35636936689.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/96153152279.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/46867387536.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/10f745997554fbb1dc956d03925d28c6/82570407274.pdfIn PDF document text
    • https://tipresentoio.it/images/file/xurezi.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607eac947822d---26626395821.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/fasijeratufigos.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/binopipokefuzivu.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/72676040537.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5b51c491e---barujoziwobunima.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6055692e1---54122576416.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/c0095ad1934a8845e16fb06d24578dcc/29078537234.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128ad5f12203---wavolejuzoxepamokupugo.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c05adbf48---84832977364.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/pawelepevuf.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/guxoxupasulazaludebide.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/xenubixoxaturo.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/40011307428.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb35d8ee6d---18085872942.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ehtuoavq5fkcdgkdludmjheo60/78447760300.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/48908475369.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/37212004440.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_off0000dfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFED 18016 bytes
SHA-256: 22eb2bfbdef69eb4b7d149128e6005764e16a1f32823000fe4a42eed5ea436bc
font_01_sfnt_off00010f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F09 10816 bytes
SHA-256: 1f61e4950d7f931df2964109b5f608a3fd04028c2f6b12bca372b1ad22f80b64
font_02_sfnt_off00012804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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