Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a54e873ae97cfb9…

MALICIOUS

PDF

115.8 KB Created: 2021-07-08 08:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 27af5419ce564631240ddd96655f081a SHA-1: f0d6a53229dbc12ae37dadda1c70407d3c23b675 SHA-256: 9a54e873ae97cfb9a4d10ec50fd66f690976a9f1576f239fc0dd109d981338b2
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 contains numerous external URIs, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely attempt to redirect users to harmful sites, potentially as part of a phishing campaign or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://nomylo.ru/uplcv?utm_term=elements+of+x+ray+diffraction+solution+manual+pdf PDF link annotation
    • https://cmfnepal.org/userfiles/files/97412293865.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73c05e730a---62736594588.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/jupamimafuvir.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088549edffdd---perugojimolisazufupa.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d420761258---27786399437.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e2e2611e02e0c59aec97bf9273023417/mekepalinufilivabuban.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/74694988832.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/bd96ae0756b45cd99b3ff33f61c7abc4/vozasajozegaju.pdfIn PDF document text
    • http://greenbrier101.com/userimages/93333274965.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/dafiwapipigejudejopuz.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/bb9da271b8977791854d19c170251547/fewap.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/0eae964b7f4e8dafd12093f0eb37ae04/daviwowux.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1adf99230---fujofizatopebujibonozatu.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/2844ca5f6c17d044c6db2f739b80425a/96635978067.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/bok2lh5hsndjejn41kbvffstr7/80622392282.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/0f08b8d1fd7b5c94cfbe40c206cefe6e/fiwonixezologulo.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160774b9ad5c35---87869821532.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/19880564326.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/08f6e85c8db919c3049b8bbec0dde98a/nesenanigemaxoro.pdfIn PDF document text
    • http://cichanski.com/Upload/file/37793792254.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160bde15532034---wogonipomedetobe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14779 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F8A 16108 bytes
SHA-256: 9ea9197b6a75c7fe67a727ea228f5add925cef9a7182c4c37535d81b948c8910
font_02_sfnt_off000174bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174BB 19064 bytes
SHA-256: a38ee009e846200685dbaa4c109ab56a138d3522ad68fc9b1819359e21e9c37a
font_03_sfnt_off0001a770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A770 11080 bytes
SHA-256: 3347ae0fd6f1d0a10e9112f4a1e525f852468e270cb51d24ef3187bc4a346fcb

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