Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d32c37181eb87d5…

MALICIOUS

PDF

78.8 KB Created: 2021-09-03 14:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffb780eb968da96c4d9d9176aac71860 SHA-1: 5d14e90f4b8f4e9b01f09de5e1c7f99260899eb7 SHA-256: 4d32c37181eb87d59135698fb7a2d3b689c3360a30227b584f953e521913a886
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs pointing to PDF files. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan. The embedded URLs suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://thepokewave.com/uploads/files/gamibavunebomaxoropa.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a6c15862f---25337583180.pdf
    • http://border-inn.com/CKEdit/upload/files/vomig.pdf
    • https://0924055971.com/uploads//files/202108120656025742.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/vt4nr777dma7cc29r7gm67l466/fepisa.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3e198303c---nipuxizolazuluva.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/d9a64dd1d652b20a761c3a6fd8c15061/kizesijakuvefivosavotudup.pdf
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202108/file/tidolupasun.pdf
    • https://festival-bg.com/media/ckuploads/files/nixobirunikamemaj.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8f240316b69b25e933ded1c7fb173acb/roluredigedapakenulib.pdf
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/19356086f8991dce1d21ef163181e1fe/16327025531.pdf
    • http://writtenmail.com/upload_images/file/68274371360.pdf
    • https://vico-immobilien.com/ckfinder/userfiles/files/43381098200.pdf
    • http://shosholoza.de/file/30727708278.pdf
    • http://escrima-rlp.de/userfiles/file/68055661470.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607041c52d45a---favamumikegoxidokifo.pdf
    • https://permargi.com/files/galeria/files/29897509507.pdf
    • https://cardion.dk/gfx/fckimages/file/pimarafafoz.pdf
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/wakapofutubelo.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/45038cd5b937511de22f283af5d97fac/338759010.pdf
    • http://atya.eu/files/file/31559297399.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/9adc91019f46ee9567f4cf88f6c6cac4/83539035334.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=networking+tutorial+sinhala+pdf+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c52d.bin
c051d2702b4f59335dff98a1e34cd130afdb5d68dad67f74e780b8ba4b0e62e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC52D 20168 bytes
font_01_sfnt_off0000fa8b.bin
e6eadf60f0d8810256f2435c726859caf1cf098ef8e1784e2af60e0e97408c12
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8B 11032 bytes
font_02_sfnt_off00011407.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11407 16792 bytes