Malicious PDF — malware analysis report

Static analysis result for SHA-256 197be2b31ae69082…

MALICIOUS

PDF

78.6 KB Created: 2021-07-09 00:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8776593e0cf456ff442ed6e133d5928 SHA-1: f85fa61695f06c596c258dd5d2cdd944bd208257 SHA-256: 197be2b31ae69082ce91e9f22df5373b544576a8d4e7d84f2563b20cdaf7471a
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are used to host further malicious content or perform SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=can+you+get+blood+out+of+carpet
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/nf8pc4uvjkg9s1hpm6vfrcosfa/2836484847.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982de323ffc---midipipafox.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/guxanelimasem.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7658333e68589925f10244c374192a32/juniwikarudup.pdf
    • https://chp-travel.ir/data/file/99535020319.pdf
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/xapizizowipokininoxovadin.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/vsonuhi81pgvo6g924t29hludo/fidijovodugame.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/pejudirasafevotevax.pdf
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/80278307275.pdf
    • https://btegypt.com/file/dujebajupurigi.pdf
    • https://sindonis.com/userfiles/file/8423629944.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44698a4965---kumemerugu.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/aoam8i43d61jahsehi7490j2t5/gepawajisizozopen.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609668fe95a18---pofuserojuxawuwosivo.pdf
    • https://veaodaibrahma.com/uploads/image/files/91170471174.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/qsqnmf41ou061paenpmmmqeaki/polejonujigaze.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaa561f1ea---deruzopenatuzemajil.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079225b8af8f---sonadanadigevakapisifiro.pdf
    • http://abacusnancy.com/userfiles/file/kekiwonuduzixuvikazalo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf81ed54e49---13645223661.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16092dccabeda2---10274691833.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_off0000d237.bin
f3946cf437d7284e26e4724547cf445bee7fbfbb3b2a3e12eb0331707871b9e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD237 10920 bytes
font_01_sfnt_off0000eb46.bin
0637a4bb59247f10b063b5ac9b1a442318a9309c5ed0dee56c5100c4b944ac5e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 16268 bytes
font_02_sfnt_off00011516.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11516 16792 bytes