Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54bb0fa19ac45f7…

MALICIOUS

PDF

104.2 KB Created: 2021-09-04 03:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 32c2e28632bb5f0c1c5b8d063bf21590 SHA-1: b73a8531796943cc45d2356242ab819a87c2f75f SHA-256: f54bb0fa19ac45f7612bc9c94ce96dfc5464c148a1ef0cfc314a9253188dee42
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and a significant number of external URIs pointing to link farms hosted on both disposable and compromised domains. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are commonly used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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://anhuishangbiao.com/upload_fck/file/2021-5-27/20210527051925414720.pdf In PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/a2fbc8628e59739f810e79e85ab88981/66866402937.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/68235658617.pdfIn PDF document text
    • https://aedwea.com/upload/foto/61282523927.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a370623e68d---99771906419.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/34b2410d864f3ac6aabfb9f691db2120/24436635452.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/legaleko.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/mirax.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/rutenuvojigiwoban.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/wukagagipufo.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/98867490223.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/legiwox.pdfIn PDF document text
    • http://signauction.net/userfiles/file/tuxotiv.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/a18280214d4259839ea95fbaebeec613/zukibosufibomig.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/jujore.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/b1d7c55ed79520e9b1af0663b1df1273/pivareburojuzigunawa.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/nigudoleref.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609aea4371fdd---xadoguxe.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16100d5c71965a---favemidomil.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/f87737cec51df86fbafc2ffe15311f6f/xifawovanibujosivawimemi.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/eefp2ekev0g4jca0e8eoodi5i5/94512388208.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/9614fe36213b7b584d5e23751619d4b5/20915460214.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/f4eb9ec9891c1ce55eadd37e610d9482/84549319801.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/27022202960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tabelle+contributo+unificato+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_off00013469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13469 17820 bytes
SHA-256: 0518b6868c9c223586609dc224ac48e99cb6a1299040ae84603e7e29e1b28d71
font_01_sfnt_off00016281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16281 10648 bytes
SHA-256: 05b4939f488bd1859c43b23fc067c34f22d478e7c7f26afd35dd3d01649f2727
font_02_sfnt_off00017ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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