Malicious PDF — malware analysis report

Static analysis result for SHA-256 f256122a6aa9eb4f…

MALICIOUS

PDF

93.7 KB Created: 2021-08-09 06:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 05cf0f0c4c86840ad81a162a5c2aa9ff SHA-1: 5e046c2b15523bc83666b65e47ec3e644ef2ed4d SHA-256: f256122a6aa9eb4f9325ea936b5f22bcc5fa11f7a7242992ecbd1c7307cf3a22
164 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c5c9b0ec3969dcc0518b75646241cf83/11155058425.pdf In PDF document text
    • http://sva-jeanroze.com/xmedia/file/ronunekuvopuwum.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160754f3d4ffc2---kodoxiriguxekilulino.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/df617c096422a237280869f0ed7f83f3/66070188517.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/kawabufevuxegiputi.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/54020139875.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/zoxovufeguvorunixurubuni.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/gag0ukc8qn545vog0k0de8s7vc/4071217174.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/powemuwowazonamipokimopi.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/11739997788.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/2fa3f23a8a18517027746a6ce746dbfa/84302921690.pdfIn PDF document text
    • https://kristinanamaste.eu/files/lelek.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ff2c2ca357d---wexakajederojudufunig.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/6038aa99972cbdd6777077a68c8e95b8/73086707788.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/kl1ptsnakvloua6jciq13u2v96/bexitefetojovaduzemopi.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd3aa17068---7151259653.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/kuvovopomavapi.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/38093862363.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/25774074636.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/64464294880.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/b9occfds0mf3dvdtu7ph6779gb/wutom.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082df41f0353---wofumaloravudov.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b545bf39055---11315642063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=skyrim+bloodborne+armor+modPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42D 17436 bytes
SHA-256: a08b4de76c2c708ac527baabe6a64dfe1d60c408afc0c2346eb01682a4dbf453
font_01_sfnt_off000121ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FA 6196 bytes
SHA-256: f5a7efc5edfb0f73fc16bdb4f02c6192b058390b74e4992d1048cd2285865a3d
font_03_sfnt_off0001502d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1502D 10564 bytes
SHA-256: 0ea04b34a7e11c4a2d784c5557cb361d26b83d4fa72beb622ac69ef8dea2f59d