Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb1f59aaa0d1e22…

MALICIOUS

PDF

73.4 KB Created: 2021-08-28 06:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3e6c156b083221d01d98f502c5bc20a SHA-1: e76623f178eb54ae2947b693a2ef6c9dcec32027 SHA-256: 1cb1f59aaa0d1e2248b2e5baafbd04394433b981c93a7cea46a6fb26965dc542
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=miller%27s+ale+house+happy+hour
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06ad76a05a---87145658382.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/64257ca9bfa3ccf46fb7cdb6586fc0af/nijajatobolonokemunojipov.pdf
    • http://ngocphuocjsc.com/public/default/ckeditor/files/tamobutujatuwek.pdf
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/demiwatirezorasavibesa.pdf
    • http://dges.in/userfiles/file/lonabavuxako.pdf
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/ugi0tc2lke7ut804jmifjjp0i7/natub.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/b0b65fae80e36f1c51265e57d3ee9202/59693601832.pdf
    • http://ural-resyrs.ru/data/file/kexixewaxijidivudinogan.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27c10239b8---zipisogad.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c3c6507e1---tufiteridox.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/2r3ldntcn39apa6dvle08nsf78/kageteloxaf.pdf
    • http://codemessaging.net/ckfinder/userfiles/files/1212408683.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087d9ec64a58---sinarerazakajemeluganaso.pdf
    • http://praguetransfer.com/files/file/numowoxobesuvow.pdf
    • https://camping-du-lac-dijon.com/fichiers/wejigodamutawajafovo.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160762496e9c80---xefefi.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/p5i9cegtlrm7f58m69p6qv89b7/33518185274.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160addb6105bed---88505030544.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dda797660c9---23316693232.pdf
    • http://geoman.cz/data/file/49278208940.pdf
    • http://mobiliteit.nu/files/26930429092.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160839391ab864---47563549966.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_off0000be93.bin
3f384c35af37035339e63a7cf9237cd099c639c9e7e09137cb766fee82c68adf
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE93 10388 bytes
font_01_sfnt_off0000d63a.bin
4fe616e98ff96afd84cb0dfa23c1bab9314deb64c87359fd879a24a140dc351d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD63A 16300 bytes
font_02_sfnt_off0001002b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1002B 16792 bytes