Malicious PDF — malware analysis report

Static analysis result for SHA-256 350fe24d0b3057d3…

MALICIOUS

PDF

84.4 KB Created: 2021-07-18 15:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c0ca912dd3e35cf67207ce0ba56b5748 SHA-1: b494587822dd3b3ff83950aa69324b90af624e75 SHA-256: 350fe24d0b3057d305fa8814175def7949984d3e9d3782c1bca78c65a95fb446
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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://luminex.pl/upload/file/vatapijokugepus.pdf In PDF document text
    • http://drjoecarver.com/clients/49355/File/rilebomezili.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/8588c360d26f0ab2f8ecd050231c1d16/vekenif.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/38173262173.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b492ec9c83---gijatolusiwipanipepiduw.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/nadazom.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/jifipajinoxotuberobaru.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/b2f2dcddf2750b99a116401df430862b/82188478350.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/rabarusabajalajeto.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/75f14a0583ff43849f3c7a32bbe5cc44/54651913372.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/t7i08uotb7kgdc56vj0e0hufg3/bokubodo.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/23823629853.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/32g1fpe37m11959ps42nlsecl2/natuju.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160734403be23e---kirilodo.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/xibozevikelemamigod.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/f3a166a71f4e643d8e1c1107bfe505e3/48365611412.pdfIn PDF document text
    • https://nicosiacaffe.it/file/51024747576.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/2cb7eec6dbda5d82992bf1de754d4135/ponotapugaregilato.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/xajomesojalonar.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/kikofetipupuserumen.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e71e2ab7bc1bae18c6cfc3f96373d82f/dananem.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714e57bfd85---metuxisoz.pdfIn PDF document text
    • https://abeess.com/userfiles/file/488695782.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/ac4d8f63b82b649d9ec21ab28d49dd02.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc371c6e81---xapajelaga.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/eb915eeeb09ad6544649fea8fe1a8956/90472879439.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/37862086851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=pythagorean+theorem+missing+aPDF link annotation
    • 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_off0000e361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE361 17756 bytes
SHA-256: cdc35ce9f533fdc94a225fea3f0c8c11a7005ebe20798cfdda514161d6247efd
font_01_sfnt_off0001127e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A95 10624 bytes
SHA-256: c56e0412de996a73c06dcaeb04b08516951c0d462d58296737f3c657f6f0cbcd