Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3cf045fb234173…

MALICIOUS

PDF

79.8 KB Created: 2021-09-01 06:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ea088ffe1beff11ebecb1405d1f80523 SHA-1: fe19a359b724791504c6e1fa4d1c18303df3757e SHA-256: 8b3cf045fb234173eb56b44489a1923d26337c71fac708ebeab15dafff22c2ba
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URLs, many hosted on compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document actively tries to prompt the user to execute commands, a common technique for downloading and running further malicious code. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=php+made+easy+pdf PDF link annotation
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/6d2e2b8e39046c76d95903680c9a6d84/88256529668.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/42812601640.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/tugavavazesodol.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/cjoeggjsskr1qpetoq0d4qupc1/3128021927.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/aa0dfbdf94bdf8b034838b5e7c223937/1945381281.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609de658d6098---wiwigivibufugezonovemese.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/wokifefipiju.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/79365461124.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/nexesubuvarutabodew.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/15005297046.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c03e516511---fepizibixekiduk.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9862d5e1f---somovekuta.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/83534852314.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/97179570240.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/qutae5cpt5aca9jg3a3m0f21gk/16675480420.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcc3a9afa5---nitizemanenukodomorur.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/kavawadevenumurakakew.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/75787053173.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/20594554781.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/77891816697.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/3551217c9faddc4cacd87f0265127c58/4963391338.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/82164898326.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/91040774146.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/6ac9888c251ede8dd0c5a27671de997f/zemawiwoxotuwetomulomif.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE903 18460 bytes
SHA-256: 564c3df37803c68688ab6bf455b0f27a665ccd53b90548c6c78b5b8668ee5da7
font_02_sfnt_off00011963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11963 10320 bytes
SHA-256: fa4192240c217f2c60e6fc739ba51776005915b7aa9d61f479b815b0bcb61876