Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce6b37600479e6d2…

MALICIOUS

PDF

83.9 KB Created: 2021-07-08 06:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81d7344f39d5b0d01c03b10e03773de4 SHA-1: 627f30fca4f99b1593e1887fcd6dba5d5c71f808 SHA-256: ce6b37600479e6d236488bdd7849a5f753a58afdf002c0583a79581e0d1a61a7
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to potentially malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://ikhmongol.mn/ckfinder/userfiles/files/nusisiserep.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/92cbcb1bf51f38c22681918a85c2af1d/jufetimasupemumiriwoxadi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8933dfcd2---migigokuxirijam.pdf
    • http://ourhkg.com/UPFILE/userfiles/files/40049732101.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076186beab9a---95019060971.pdf
    • http://toonesk.com/upload/40866581931.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cb14051b6---7567213116.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/bb2f47dd56f7e4ae17dbcc3d8077cba5/19175561597.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160796d5854127---82609567485.pdf
    • http://iaestedresden.de/userfiles/file/nexiluriwakanam.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c7f2886f---nivuzepuzove.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/db6589965f8d9aa82b1c4b2a76ca39ab/gokomoziwoza.pdf
    • http://syuncyoku.jp/upload/file/borub.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/225ebf530fb35d8cb9cfa44a52726ba1/58853196384.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ddb2a5d95---65871511735.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/ef563efb66e9acf68aebfcb05e3c93c7/45001693932.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/4ad912915d1c607670c3b996b7ef9e03/57189853486.pdf
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/56905871828.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc3f35aa7a---19806725696.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608848d803a50---13985222188.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16070d00c8b0f7---96028444976.pdf
    • https://sibconsulting.com/contents//files/11122162201.pdf
    • http://abogarestudio.com/userfiles/file/demurama.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=american+headway+1+second+edition+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_off0000d92e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD92E 16792 bytes
font_01_sfnt_off0000f140.bin
a1bd23ef26bf80a41eeda0db34201727e5385ba84da8de2ae9160601ebbc4c52
pdf-font-stream PDF embedded font (sfnt) at offset 0xF140 22044 bytes
font_02_sfnt_off00012841.bin
1daeeeff2480eda28143a2133f455094415233ee2a3adf5c501f32038a67c317
pdf-font-stream PDF embedded font (sfnt) at offset 0x12841 11072 bytes