Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5f3fa156de6c48…

MALICIOUS

PDF

92.5 KB Created: 2021-08-11 12:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 592e62b2f17c99b199c7fc4d24a0d72e SHA-1: 4b8b1d44569b16753a51c5bcf735c84647225ef1 SHA-256: cd5f3fa156de6c485dde7c9f8a086bf29ed047b3da9e5469153e45a675904cc8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/2b2b8f429dcabbce2be6a737c3d67e65/poturaperutapezesuvagak.pdf In PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a9a00c5d2---52085153853.pdfIn PDF document text
    • http://scro.ru/pic/file/63338045664.pdfIn PDF document text
    • https://ksboutlet.com/file/files/fajoviwoxomunodo.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609189e03ee62---vurawav.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bac07646dd---kizojifug.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/nasolafuwivakozotalejib.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/juxowikogonabexuvor.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210616_C344C9513349E30F.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/dv28ikkhu0opmcf636r46rjvs2/ferisibakikadas.pdfIn PDF document text
    • http://lighthouseofworship.com/clients/44803/File/36840322509.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/videgejenowuvif.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/0ed16632526f2d800e58f6a76685bb28/rupufujikuruvuni.pdfIn PDF document text
    • https://lavaecucebrescia.it/file/96621899311.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/d932b9826ad719c8335c7e618417211d/tineselesofeg.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d307b01f282---55548826603.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/316u9ei5da6m6piairjhttl0p6/78005351337.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/suroma.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/80844559485.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/d46174cbad1084d5945d6b043919b8cf/tubusedizugumokeg.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/87404781418.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/49304030847.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/73596595016.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/207vhm8vgatvmigi2d3v3p3i96/javegidorewudajutes.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/10d02279b2a08a9e7c21f2be3ba40840/23982800822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pride+and+prejudice+by+jane+austen+analysisPDF 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_off000103c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C8 10872 bytes
SHA-256: ceb75bfbc132e690d1013ed990e720422236d0c0a89b40d4a5f704988db7889d
font_01_sfnt_off00011cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBC 17976 bytes
SHA-256: e5336f439f52fb2a4683c15d37e267f14d6d8a1e18e8789d1772484260d459dd
font_02_sfnt_off00014b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1