Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e9946539b57d39…

MALICIOUS

PDF

70.6 KB Created: 2021-09-18 14:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f237d9923d4cfc5e84b93636daa5a017 SHA-1: 77053c6d6971d7e643e193b7a855aa28b431cd1e SHA-256: 55e9946539b57d394837acb7fb3020dec0960148cbda4c5bf6910109b62737a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript 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 0.9978

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 http://classiccar-jp.com/js/upload/files/28855983966.pdf In PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/4088063948.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/75243841509.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/vesulogavukubotajuwikagoj.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/83520134305.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109041931069541.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136622ccf8bc---32517845757.pdfIn PDF document text
    • https://vientangluc.com/upload/files/29125862248.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141816f7254d---xesetinerimoluxamatax.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/jebogafirekabam.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614298ac6077e---mabebinumobibaxunud.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///48546499910.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/51786014598.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/wuxav.pdfIn PDF document text
    • http://tai-group.com/upload/files/wilovitipe.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ebe5d6105---difixefipenutavelejerebas.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/gubezifulananifogewaz.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/sobebemujowijaru.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/d553da7836375537f82376cba0165027/65281396270.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613cda75bc5f5---76087467103.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/zigojiduwigezubomej.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/jidixifunivuzeguroj.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/82097099750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=hack+wifi+android+rootPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB502 10292 bytes
SHA-256: 40cdcd4be809504a10c6031430b6df723c2be75b6992283cd1a6be6dfb8113b9
font_01_sfnt_off0000cc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC50 15896 bytes
SHA-256: 501a47b42b18cbbee4c781c1ecbc30a3c8b5f259eb9e8c8b67bc536071b0f4b5
font_02_sfnt_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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