Malicious PDF — malware analysis report

Static analysis result for SHA-256 11543b308d14e198…

MALICIOUS

PDF

85.2 KB Created: 2021-09-22 14:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f3fa82a827786602ec5e0948e63e37f SHA-1: 464540bdaec74db9c8836b6c94843d9c58d045d0 SHA-256: 11543b308d14e1982a24c185e8a8e009f665a53d1ef9c1f8729c3ad6143aa09c
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 uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external URLs, which are probably used to host phishing pages or further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=the+uzi+fortnite
    • http://sushiyaslo.com/uploads/files/kosiminalakalufipojowex.pdf
    • https://masterjobintl.com/ckfinder/userfiles/files/95107013733.pdf
    • http://abcgsgeds.friendship-match.com/upload/files/woliwuvikibej.pdf
    • http://polyalpan.hu/_user/file/nuvopelepijej.pdf
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/70003545756.pdf
    • http://lnaixi.com/userfiles/file/20210914135556_1730445794.pdf
    • https://frontivo.ro/userfiles/file/xagilojakawinijebi.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd188815b6---kenejuwakezirudi.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/5fff0495fde5f16d99d6a52f7b4496a0/vuwoj.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612edcf370f3a---28018340517.pdf
    • https://eko-briketes.lv/userfiles/files/begoretazusepelunez.pdf
    • http://totoumi.jp/upload/file/98186917337.pdf
    • https://marblo.marblobaths.ph/app/webroot/img/files/lokusaviri.pdf
    • http://laxycoffee.com/upload/files/lirojew.pdf
    • https://e-tta.com/app/webroot/userfiles/files/povapewudume.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139215b055ca---dixax.pdf
    • http://mudrkanuch.sk/editor_uploads/system/files/nodovubebomanabibabokabi.pdf
    • http://nagakuratrading.com/js/upload/files/gakanonirejivojo.pdf
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/dilazesamemilifaxeliped.pdf
    • http://agataklimowska.pl/userfiles/file/51400471072.pdf
    • http://birdwatching.sk/media/file/69397727284.pdf
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/rasanoluxilo.pdf
    • http://thestarbusan.net/FileData/ckfinder/files/20210919_DC49032060096743.pdf
    • http://wenfengsi.com/wfs/WebFiles/file///2021092113140925.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_off0000e580.bin
53399aa48e06225d1f21bd6abe205d867367a1a761c7c1597588d051afd12fbc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE580 19388 bytes
font_01_sfnt_off000118a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118A9 16792 bytes
font_02_sfnt_off000130c0.bin
a8fcaeb2e86bdd3775d1d2cad5554251c0c269563369a24921c6a4dcd9bd6291
pdf-font-stream PDF embedded font (sfnt) at offset 0x130C0 10056 bytes