Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d6d78564beb3c6a…

MALICIOUS

PDF

77.5 KB Created: 2021-09-12 11:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c189b81a3df35dbf360b184a21ac0458 SHA-1: ba4fc4934886bed57be10813120393932c5919ca SHA-256: 5d6d78564beb3c6a90d5745b823e32a31f2227ae7dd444971a0264d3136a6cd0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://intervalhousehamilton.org/ckfinder/userfiles/files/63333616357.pdf
    • https://landatur.com/files/galeria/files/ziduziv.pdf
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/5363854390.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/77ab5ee856c065a7fe2b179124e1e28a/wokituximapi.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/lkurrniaujcr46jh234l9mao27/gerolefafixusidebaperoxaw.pdf
    • http://massageindex.nl/images/uploads/99196659711.pdf
    • https://zabulgaria.org/userfiles/file/posoduwajimowawugovop.pdf
    • http://yuilchem.com/userData/board/file/35535210166.pdf
    • https://www.xyoaa.org/sites/default/files/files/gegidopigi.pdf
    • http://gangwonbnb.com/FileData/ckfinder/files/20210910_5FE675AAFC7C5C04.pdf
    • http://prochem.vn/images/uploads/files/92595477388.pdf
    • http://myslizdrave.com/soubory/wanepixabagimiturateweso.pdf
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/98269513154.pdf
    • http://ventss.ru/userfiles/files/30081384880.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/6d1e6f299925f259839514a67ef19b06/sarijejowazizejofixegaw.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135cab543ff6---nejukivemijifimuzozi.pdf
    • http://uklearningnetwork.com/userfiles/file/71688211974.pdf
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/mumulimojemipirepe.pdf
    • http://darstin.com/userfiles/files/21836773898.pdf
    • http://denprokhorov.ru/images/file/pewafirilimamanuf.pdf
    • http://planet-for-events.de/userfiles/file/70780319558.pdf
    • https://matratva.in/userfiles/file/61974996042.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/54d9c567c91c73b0b7843a7aa6347313/jevison.pdf
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/regowiloza.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=hot+comics+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_off0000ca5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5B 16792 bytes
font_01_sfnt_off0000e26d.bin
0aec1f0e9a207736662182720bab0c4d5db6d0aea00a111d0c0aba4050820e51
pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 18020 bytes
font_02_sfnt_off0001116d.bin
2c339455d81070b2243d8dfd69b408e4ca926be549ceb78dd5443e0b2dcd6ca3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1116D 10228 bytes