Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5bb1c9d350469b4…

MALICIOUS

PDF

137.1 KB Created: 2021-06-09 01:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d287c30b169b9181f4157ba51ca0fe17 SHA-1: e1fabc1e250959463d0299c36652be3d9d0493a8 SHA-256: c5bb1c9d350469b418a77d3acca27f9d8ec6ff01f435c388ca612757b7626964
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment

The PDF document contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to host malicious content. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs the user to copy and paste content into a command-line context, a common technique to bypass security measures and download further payloads. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://coretry.ru/uplcv?utm_term=shirdi+ke+sai+baba+movie+mp3+song+download PDF link annotation
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607998844e6a7---bopunojarupi.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/717b9f14a6b0eb64419532d1156be158/2552552484.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/h8cuk5rpnaa18fpvqujjnsvsn4/zixoziligaripezaji.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/78a8f932ebf19c80122e2f6bb5aad3f3/50989649327.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b5d0977188a65d0e95448b78e39951c6/wazejisudukusegurigorawi.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607424cacf6f2---sojebutizofulinukuli.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/1115e5314ff46b5b6e25bd14eb6220ed/8980014018.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/dece6859b32ad68874f14d916e28a862/saxofinolejusimizoremox.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/2kd34fclj547fmk3oskr6p4912/24115508228.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b135579e0---rumipuwuririmaranirata.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a4c896183---45093211189.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/vixetunadudowagogitori.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/37569787325.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/nahs1bhn3j2hth609ojt2r53t1/perumatevifozapoki.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/tg9socff0kmhci506f9qf3p5j4/83640584531.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/69bbcc9cf594e1848c36226dddf4a41b/piteb.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/vga8ggcis2t9jm4e3eu7h70bfm/99592691734.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB19 5996 bytes
SHA-256: 150d890b1cae4f5782265bc373a40554b1c932fb22088711fd2254c800a0b86d
font_01_sfnt_off0001cf5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF5C 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0001d7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D7E9 11720 bytes
SHA-256: d7b45d89bbb5d781cd40a4f385d8e8a05e47155fa7e5d103ae7cba407a32d5a8
font_03_sfnt_off0001ffbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FFBC 16568 bytes
SHA-256: 0d30145b9f734696434a0d09d3d5e2bee670b76102db8ed1ecbb141e5a611e8a

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