Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c943e2c49c691d3…

MALICIOUS

PDF

90.7 KB Created: 2021-08-18 21:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4930ef5bf5a7a0b396c17ca30cb974fe SHA-1: 1b458da9d031e68bde5b32626626e184783fb7c7 SHA-256: 5c943e2c49c691d3caacbfc503905d0878c5c05214b4f54aebd842b3bc0f6f2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://krisoc.ru/uplcv?utm_term=ejercicios+mrua+2+eso+pdf+resueltos PDF link annotation
    • https://littlelightnepal.org/userfiles/file/giresojifurezorip.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/silisimepeloxokazor.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/56161723066.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1611b3118be1ac---vekazevefuparepuzenederum.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/ruzubenu.pdfIn PDF document text
    • http://fruitvita.com/files/files/duredazatuzabow.pdfIn PDF document text
    • https://immobilgold.com/file/nomubebomogoxufugaf.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/b95da3461b88956b84567dbd4c12f41e/gapadaboja.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072b08b1b734---18983914761.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f68b139918b---bilofeji.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/moxuwiriditezi.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ade754a80019070a18e8dfb2cca53407/zavikifatomoko.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/34696165197.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/botefepesenikaliruxirafe.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/90647072098.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a80df8056a5---temukigezawifima.pdfIn PDF document text
    • http://bjallstar.com/upload/file/50880162984.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/nuperixamajubadi.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/vajumenenagamenud.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d4107d2659b---toredevurozonaporuj.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f016b22900c---wivowukodonevofowizademo.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/d5ef98c27f298a5f9939133b13dae85d/jurivugunogozenajibij.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f12908d15---katodiw.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcade73cfb4---jedez.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_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11273 11008 bytes
SHA-256: c14c8fd9dbb7c608d5d7cff5dff82091621efecacacb54d6ce294ad81346e5a9
font_02_sfnt_off00012c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C13 18580 bytes
SHA-256: d6742246395351eae3ea53cb6fcc89da39390fec07dee4602230938fd06d2ef4

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