Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1db24f8243f08bc…

MALICIOUS

PDF

86.1 KB Created: 2021-07-03 14:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3735d0dde0da5d125afc3e4edee24c23 SHA-1: d05c188bcb9f29d14296fa5501093c5688e76d54 SHA-256: e1db24f8243f08bcda4b5a1a9abfe834101eeb9be1c1797b7ea11ff39d279f0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites 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 0.9942

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://a2designbg.com/userfiles/file/59390115549.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/afpjnesf5ehfpilbuqo6jfe8vs/zonedorowerenamimo.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750734afa74---vemeboxixupamidupoxan.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7d9ee14cd---veripibupikajo.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/0269a2b92be6f71fc2bd23008acdf18b/keralupigometuxolu.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee08191959---73909528457.pdf
    • https://kimtuong.vn/isc/public/files/fckupload/file/61010249329.pdf
    • http://bawaconstructions.com/editorData/file/87204332237.pdf
    • http://ritadas.in/userfiles/file/76924533762.pdf
    • http://xn--m1age8bh.xn--p1ai/files/file/1761227018.pdf
    • http://universalthailand.com/images/uploads/ckfinder/files/89853113391.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba3c227054---85527599293.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/0c67ae999acc75ccd93efb8a6cdb8c97/gokaxu.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a706e2671f9---gelunowozanubiruriwuli.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/58ba02ba82bff3f51c3f36ada7a18331/32843315677.pdf
    • http://webdulich.com/js/ckfinder/userfiles/files/tonibiriruponeluris.pdf
    • http://brmhn.com/userfiles/file/20210702105849_4pnpos.pdf
    • https://alianzatours.com/imagenes/file/7404788161.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd9970286c---5664217724.pdf
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/sokujimimo.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0983e795a---tavid.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d97239fa---74785126871.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/33o30073akrounu9mpnj58r09j/negexazozekigof.pdf
    • https://bbpartner.cz/userfiles/file/15867063312.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d5a0ded8da70e1ac5e512dd79f62c7ae/2856449527.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=fornication+under+command+of+the+king
    • 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_off0000ecf9.bin
15289e6c4bdc7046cec1feb7d877a50ddbd931e46d00a0be69e7522a7dbc25a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xECF9 10880 bytes
font_01_sfnt_off000105bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105BD 16792 bytes
font_02_sfnt_off00011dcf.bin
e9bd2e13fbb9ad4b3ff69037dc4bdfdaf2365b179e4102b67c7e22f9ef4c3e8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCF 17424 bytes