Malicious PDF — malware analysis report

Static analysis result for SHA-256 78aa1afa90051977…

MALICIOUS

PDF

217.1 KB Created: 2021-07-01 18:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6dea51d9c300253434e01c5cd37458b8 SHA-1: f9b70a32a6a4e14703f246bc53e95a50573861f0 SHA-256: 78aa1afa9005197729d022ebf559453cde03b97349cbb07653b34c210482ec8e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

Heuristics 5

  • 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.
  • 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://queure.ru/uplcv?utm_term=computer+dictionary+a+to+z+with+meaning+pdf PDF link annotation
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7770ef782---24069239701.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/29037730083.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/be74ba16f2b39c243b6dbe3bd448c19c/wakepufefapakefipuga.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/s5lopndnv70v94o12i0179leh0/40765743337.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ada7f52ad64---13436908186.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7a119e58f---35417281795.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/weguxewi.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/doi0v3uljs97hom4ogp6qnvcuj/fokovevolufi.pdfIn PDF document text
    • https://bursac.net/userfiles/file/dodotulodukirirum.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b727a10cb---toworupuwolelozoxod.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/mebosupivamiroxokajilugap.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ff5a8d82e1e12a1dad632485840a4ffb/62003060116.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/03407f17355a76e5b246ce196865483a/midukadenunu.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afaa862a76c---84639115165.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082204301c3a---vifevub.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdd5f47074---dedupidubepiwel.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885580ac898---58973473642.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/11355941651.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/rupetigidujavif.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/auj86ltb162sj7o3v7h5coomb5/luzadosi.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/kj0kg1ggbj83h0ro2t7ocmospe/3675768442.pdfIn PDF document text
    • https://2acontractor.it/images/file/37778956447.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/63188782232.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/nomijosukezidiziwa.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_off0002ef70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EF70 11244 bytes
SHA-256: a2eb17c88d8148f3da3bb57d1ace3c1474bf8722eb8448ce6fe76cbeec2a689a
font_01_sfnt_off00030989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0003219b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3219B 19876 bytes
SHA-256: 08dffd74989d3b2f696386ac6f6f51c95d86349fded079e547e0b7a6f9983c39

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