Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff07c170d9640d96…

MALICIOUS

PDF

95.7 KB Created: 2021-06-26 00:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25a41049b250e9805cfd99b80f8c7cd6 SHA-1: 3f19d102c8ca0a9bdcba53b718cd2b53f4ebe161 SHA-256: ff07c170d9640d96ce0f323dbc226326d4e769f56165c4731a3dc5395a1a39ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm pointing to numerous compromised WordPress sites and disposable hosting domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The embedded URLs are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=asian+sexy+dairy
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3dacc6e3a---57790751314.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d0ada139ee20b9fc897ed7f4484003d/setoganim.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8b6d16a18---fajubujewimu.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8n9525qvlccrhcidn0kndk13hi/weremedu.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/2cbd3d9bcd994467c38bef78d02a68bc/28636403159.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bf38724de---73994255620.pdf
    • http://enotecagaribaldi.it/userfiles/files/89480999527.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fe29b67a8---kalamegivopegufituvonu.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/41e65e04a75ffe4b4859b09baae8644a/12886658326.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/0frg8b0h1knjvaoba1d5sor3dr/6588665512.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079e7acb8f54---ralisegatudisakuze.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/aa67766979db4a9bac83dc102d144b8e/47656515361.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dd1ed7f58---temefasubuwawopibapijox.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/86efc85e91aa9327fb588efd1afe4d5a/tanuwitenibuvukowapi.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16078e87226413---wawizizakufezesekoxemuger.pdf
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/59555803795.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/4g5p3f71f7qlhotpt673h4bupa/maguvuwikekasiv.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/d64d171ee49b8d2904a66e94b63d24df/dizixujatatavokuveti.pdf
    • http://apogeeconsultancy.com/upload/files/lipebazovonemiwi.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b301240912c---zenitamurigalikexenawufag.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16086bb747897b---turozixumumulepujebik.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085195bbdce2---debop.pdf
    • 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_off000115ed.bin
9ab4c703400fbff54729f95819782653fc908193d6553035d669ab70bc921250		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115ED 17596 bytes
font_01_sfnt_off0001431f.bin
0754348d6490385a150a3e78430571f8b372292a6cf741bda4aec6c98e2bcaaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1431F 10176 bytes
font_02_sfnt_off00015a03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A03 16792 bytes

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