Malicious PDF — malware analysis report

Static analysis result for SHA-256 324dcfc325bf8775…

MALICIOUS

PDF

81.5 KB Created: 2021-06-28 08:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 963b758132d538753158fe6a4434ff86 SHA-1: 3ddd3fa4f46de7efb7dffd511fa327df8f3545a6 SHA-256: 324dcfc325bf877513fa40428264a23e7d585d5939cdd78870d3fd199a17bc3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://infrive.ru/uplcv?utm_term=victor%27s+piano+solo+sheet+music
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/cd198419639f3ad287360077137e4572/43148840349.pdf
    • http://jfk1969nola.com/clients/873000/File/kazaxup.pdf
    • http://stroi-sistema.ru/img/45681192499.pdf
    • http://bitite.lv/media/txt/122/file/lerezesageliboreletefu.pdf
    • http://topcudental.com/img/userfiles/files/sawivizudinizot.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c397820ca89---nesemiwojebivagenaparik.pdf
    • http://omonetach.pl/foto/ilustracje/file/rulibotewomaromexaje.pdf
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ridatoweside.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f6402cca1a6d6c4cca1fd7fe7a2f7a13/93819931453.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/dd19eee285fac2323561eb83d6a84dee/mezesedefumuwofene.pdf
    • https://webtechnocrats.com/upload/file/30846585848.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/3efd32e03f9ea8d4e4383dc7e2ff8d83/28189101676.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16093cee36bd2a---69827794354.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082b3aea4857---forasopexole.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607602f03ce6b---88876663473.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/d0srvppdlfives68oh19mugghi/tonidaragalaxagutek.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070222bb1eea---muvolopotezebotawofotakij.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c45c45761---fagevevepifukavuxodiridi.pdf
    • http://chapelguild.com/images/usr/64181748967.pdf
    • https://mt-creativestudio.com/ckfinder/userfiles/files/tavokogikidi.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5db566266---53620642579.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16092b4363f3d0---1875398251.pdf
    • http://abwalabamaave.com/uploads/files/nesuzizofome.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_off0000dacf.bin
d7e7407d0695662742013c7a6e31acd1975a087a291d3ffd507a402f0806d1fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 17192 bytes
font_01_sfnt_off000107ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107EA 16792 bytes
font_02_sfnt_off00012001.bin
790e8ab557ded993dc16671f40a3f8d86e12c99539080db4494fdc57c8704dac
pdf-font-stream PDF embedded font (sfnt) at offset 0x12001 10744 bytes