Malicious PDF — malware analysis report

Static analysis result for SHA-256 743e8cafe568ae0d…

MALICIOUS

PDF

90.1 KB Created: 2021-08-09 23:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 49d1a20c146d43fcedc8225f9eb0167b SHA-1: b6d3fdcc3bd32923badd9a4a62ad146341bd8361 SHA-256: 743e8cafe568ae0d407305c642fed478709d344988f6f00dd1484cf3d5177bb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging a technique often associated with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/b9c2add63a4c9a063316d8d67327064e/jaritidabirumoderofavu.pdf In PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/lomilunibodu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/47446a09f8a09cb93cbb9c41f3a57658/sokigopewulazeso.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/23e7697e8d929fe3266d5ba112d815e8/zegenibukujarisuvutegozo.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160af6b5a2d5c3---jakopudetusoratapugunitu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/jpi202f5hqv5c6avotqqfit7qv/71513579082.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/wanumuven.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/8692c414e18d07f796984208b2c2e002/ramejafovobufanibufike.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/34586018831.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/tigerawejerabanof.pdfIn PDF document text
    • http://healthywithhart.com/res/file/70441986908.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/12922626804.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/2313691229.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/95460e59e51f4d9d84b40c1df826effb/71548598864.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/4790720324.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210608_F57241E0D1F2F874.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/66856077830.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/17456544540.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091f2de8a38a---natosogotirumiba.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607768c49ade4---43709280907.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/630e025c4a57a09ceca8c5f936481025/vusometu.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210721070057.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/pibusopomalib.pdfIn PDF document text
    • http://imi.vc/upload/files/81131048387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=hixem+g%C3%B3mez+se+suicid%C3%B3PDF 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_off0000f7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B1 10476 bytes
SHA-256: cf0b5a7935145114468f09845d5a2a1197b099f645bf195daaf0c81a6402f228
font_01_sfnt_off00010f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F52 19388 bytes
SHA-256: 743198e428c718dfd37a8bddc22932bac3846692fee499be932e303ffd51cee2
font_02_sfnt_off000140f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1