Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33ebc561bdb5a48…

MALICIOUS

PDF

90.7 KB Created: 2021-08-09 16:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9f400f17c133ba55305a760a1edb26fc SHA-1: fdb41ab3acbb08338aa85facf6a89dc6fe563044 SHA-256: b33ebc561bdb5a480d5ee7f7919662935f6aa3b0c0528404550454dbfc1904cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites, likely to facilitate phishing or malware delivery. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072c2e4ecb9c---pumolisovi.pdf In PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5de499a0b---niruxovejadofijevozarosen.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/59689163107.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b05780c159d8a8e996996f81ac4f9af7/8653648299.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/4a04dd4813cfe642f325cf6274d3aad3/43722021311.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/88280644262.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/q5e06b75nuuvgvqbr31hqccra3/bemuxi.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079ddec4742a---gejar.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/90006289627.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/60917440468.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/34ac83ee3ce19ed8bc50cd54756bdef1/jinepasijorut.pdfIn PDF document text
    • http://packturf.fr/files/rewaxegu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/427ne6g61dh8q3qq1lq36d73f7/65359179281.pdfIn PDF document text
    • https://andrejc.si/files/file/25299525226.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/c30d45aaa763345866f013e6b95cdc16/tozatukusajobozevataborut.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a48e5ccff22---77849314481.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/abac6cf09ae8a8d885529af329658c12/18701562683.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/mobapulovotolirekan.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0825f4832d---jorin.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c238b0a4d61---tezituvizutemipo.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/devovumizurumegijilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=schema+va+et+vient+3+interrupteur+pdfPDF 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_off0000f4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F0 20816 bytes
SHA-256: 22e3d482d5068714ac5cc71428b6387f553068ff1bcad678ba4797dd364c3f12
font_01_sfnt_off000129a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A4 10964 bytes
SHA-256: 04dc998eceedcdcf44f5b682f98a902237107c3a8e3893eab822db253055f700
font_02_sfnt_off000142f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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