Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72b3e1a5bb3ad9a…

MALICIOUS

PDF

73.5 KB Created: 2021-07-02 06:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08e10761242b5301853cf6364914f6fc SHA-1: 424e1ea30de2886507e989e65b5a50292917ed60 SHA-256: a72b3e1a5bb3ad9af501579d56a7e0b163d56e2410507fd5bd9c6d3e575b2f4a
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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 http://holzbau-napetschnig.at/zakijutum.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c8624a34ae8---59263105151.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/195f8f3a226763fcf97084d09f5387c1/nosakolerogebuw.pdf
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/wexedomedu.pdf
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/nazugerozefil.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/1j1qqb8urjf5ncti7tm2kfrc51/berilagenududerukagav.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/9855633c432ea139bdfb5c5985a553fb/58381349211.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e16de9ba9---87330189110.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/sdqhucs4euf5jmu5avm6e68per/lizemusurusi.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b83ce0d196c---80314480422.pdf
    • https://mides.vn/images/ckeditor/files/39224489274.pdf
    • https://walkandsmile.com/userfiles/file/63346490583.pdf
    • https://louvre.lv/res/wysiwyg/file/mebemureg.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/4000e1cc9efcb2520ec83aee5a64fed0/wibujaxaxuta.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f3f7d4cac---3336846926.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c93068852---xejifut.pdf
    • http://fatamorgana.fr/uploads/assets/file/xemazalurimuwafimokoduzo.pdf
    • http://aimic.com/userfiles/file/10279016479.pdf
    • http://sushikyototogo.com/uploads/files/943741080.pdf
    • https://aduanaldelvalle.com/userfiles/file/gixejumenisopid.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/3ncpdiju3tug2c8a1cbkivh6v6/3136290939.pdf
    • http://skogsformedling.se/bilder_umeny/File/62960961080.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=electrical+and+electronic+principles+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_off0000bf9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9D 16792 bytes
font_01_sfnt_off0000d7b4.bin
d2d09582e39758f203898dce22e5cccc2e524cda92a54120c94788251a956941
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B4 10596 bytes
font_02_sfnt_off0000eff7.bin
5aba0fc649e814095e9d1cbc0efa954501e7ccc68a80a9a755da4a04cc57a226
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 15864 bytes