Malicious PDF — malware analysis report

Static analysis result for SHA-256 a001e754fe045a31…

MALICIOUS

PDF

185.1 KB Created: 2021-07-02 02:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d447f72d4b6ee91e5a5131c8aca4b645 SHA-1: 83d4d1757e499c5b687e6bae3dad64ce82c11ac6 SHA-256: a001e754fe045a31311b9670717aa1f67501f4e64fd65587464195d08385bd1c
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, suggesting it is part of a phishing campaign designed to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download' button lure further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=amplitude+is+measured+by
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/9darvncv2m0leu4oag1aaifu48/88641883142.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607577b3b1f91---25582951721.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/a14c8de1d849d86139282254a9a618b3/tutesusel.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16099de80b7ed7---22385506790.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/791acadc0a234e96cf99411c0f10b35d/2395372377.pdf
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/vufuzokutevamodivafemug.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b864ed06a2d---tosatudi.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad92b279391---43171751497.pdf
    • http://diversecityuk.com/userfiles/file/mekesawepagegaditego.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/11206814dd9ee859bed1d7d914569702/55233216671.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/febevafuwixo.pdf
    • https://syteq-pro.com/userfiles/file/nukatakutatozuga.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/0e0e3a2b07e05d0e3531fca283cc343f/49482552484.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/cda38d7ce706951dbf835adda06a1017/balamulod.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160805dc1c9834---11537092137.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/40412241399.pdf
    • http://pivotal-technologies.com/userfiles/file/50892572645.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075db7aca979---desejonokufodimatopi.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/77a3327467850c7a1f91af375e5557a6/wivugurabikopatim.pdf
    • http://vaness-sens.fr/ckfinder/userfiles/files/15213652956.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b27d1a7bfea---2595080685.pdf
    • http://radio-salsa.com/php/rs/filesupload/file/fujoxorupo.pdf
    • http://promador.pl/userfiles/file/kokixaluzuja.pdf
    • http://promocode.lu/userfiles/files/sifini.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/b5c22921264e0bfb50e35c345eceef53/naleti.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_off000271ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x271AE 16792 bytes
font_01_sfnt_off000289c0.bin
4ac5ff6f4c4fd5315bee1b43a9748bec1cfe43a904148ce2f0e2eb8dc34a2f8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x289C0 19784 bytes
font_02_sfnt_off0002beb4.bin
5319d80dbe3c3e9a36dbc3adf35e20159512ed4e48e82b834615666050667637		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2BEB4 10664 bytes

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