Malicious PDF — malware analysis report

Static analysis result for SHA-256 618b67c8facc6d93…

MALICIOUS

PDF

87.4 KB Created: 2021-06-30 10:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 120481e2d6c8e619679099a5abc2aa6f SHA-1: 7c848853c80f52fb509d83fb4df85320c2a68f54 SHA-256: 618b67c8facc6d9364c77f9f7ee7e507da92a1ed03e01e3ff11618e7d8d691a5
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 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 0.9961

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://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/fn25cmundstdunrrpr6blglp8t/86072201913.pdf
    • http://rld-carbon.ru/file/lawezojegokar.pdf
    • http://architects-desk.com/uploadsfile/60533608038.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160984475d0e01---sabilakimob.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/4abf7f310c2c1cab7cbe19d77dc47847/bosos.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f659d811c4---91473398174.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/vh82rlrtrqb36jbu3vbhp77k3d/bikejivowavulupobegejufu.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/73lvaditnvulq5r2j7vuphaf93/2999610419.pdf
    • http://ankaser.com/userfiles/file/nerabozatumiravak.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/0qs39chmu372ltpnipu9a85c4e/mikomutagonive.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f47edc610d9977d12cee9d3cab28d375/71818176426.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/a817a7d9d30a695186efdb9d2462c966/58145851391.pdf
    • https://sfasg.jp/js/ckfinder/userfiles/files/24132182473.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2a701bf53---67529586126.pdf
    • http://karpatskiles.ru/store/file/bijivaz.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ktp4d2ivii8e388l8aj83s0hvc/wujimi.pdf
    • http://cayxaotamphan.net/userfiles/image/file/reweporilasufubodob.pdf
    • https://led7.ru/file/99643259786.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8d84c4c8e---99392813574.pdf
    • http://www.jacenter.org/js/ckfinder/userfiles/files/xifife.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/8f95248fc2c7ff527b0e4f4dc32e5866/sipejati.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=unsecured+revolving+loan
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d958fadac7c4d4114018c618048e26c3/dituporidazumijazi.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_off0000f4a8.bin
c0ba237d9626864cfa1e0ff2e55fd918163ad0f1cadb7294cf4d45e2dc70352e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A8 10620 bytes
font_01_sfnt_off00010ccf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCF 16792 bytes
font_02_sfnt_off000124e1.bin
6179dc3e460141e9375a2dc6565459feceba6f85feea0e44e720b461236205f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x124E1 16828 bytes