Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a0b4063ee6da16…

MALICIOUS

PDF

84.8 KB Created: 2021-06-27 14:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de19ab4dd9fa3a3851fd4024dba0a650 SHA-1: 453887d4b2434de731d05b1dc971c50072c1534a SHA-256: 36a0b4063ee6da16d38c1ef907f8aab0acc5c82fef7b0068257630489a1ea675
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links pointing to compromised websites, suggesting a link farm designed to redirect users to malicious or phishing content. The presence of multiple links on disposable or compromised hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b22a46e0388---60562176224.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/06rrhp5paja7vahbk5gma36jg6/31671004970.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16085f4c708193---rudofi.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d3dcbd2e8ac0dda57689fd999d103faf/92512600602.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee50651a0f---somivizofukegonuz.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca16e85a6a---pizonagosi.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/4eb5b71b30c8554a44c8cec5d5caa199/foxuzinasaw.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee093d72d8---wuzomekizajatadepidafosat.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/mggofbatrmt0u6cl4htur3e912/29789988348.pdf
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pokunufowore.pdf
    • http://www.sealjet.mn/pictures/files/78830195387.pdf
    • http://peneleos.pl/userfiles/file/xurotanamogiv.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a00076dcc---10877566028.pdf
    • https://soechi.com/userfiles/file/laredazifubokexujotevi.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/kb0ilbcnrffkal5j13gtvm4fu4/sufavipuvoti.pdf
    • http://www.pattyn360.com/upload/forum/files/jijamuxalugixukojefomuve.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cb1de44fb---lunasoponowegakotapob.pdf
    • http://homeopathyhongkong.cn/files/60310047067.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939f9f2852e---49149811254.pdf
    • https://gerastar.com/userfiles/file/pobili.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a498879d6c---zazoxe.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf81bc63dd---levujapepazubitexawapap.pdf
    • http://www.deep2001.com/images/library/File/23771258005.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c63115d8658---luvejizinodomugixaf.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab69969402---sulugubububira.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+yarn+over+before+a+purl+stitch
    • 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_off0000e96d.bin
538e5b96023a344b5e4f6aaccb38cd82adbf60cf1fdff805b060dbb1d25cc19d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE96D 11072 bytes
font_01_sfnt_off000102fc.bin
3f1d99a7c27a9fa0fa54cbaec3849baac50015d0bcd0be53fd37c1efb2f7c0ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102FC 16572 bytes
font_02_sfnt_off00012ddf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDF 16792 bytes

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