Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4778e010a30bb3…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 20:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 652ed9a8bc59fea205d0fe5b8db56ebf SHA-1: 96eed2452b0318f42946cc60165142d7f7de85fe SHA-256: ba4778e010a30bb3b4d92438815cf799b47786eac4646d2d0f4f559436e8f340
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS upload directories or are part of a link farm. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these external sites, which are used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://garglob.ru/uplcv?utm_term=thop+tv+latest PDF link annotation
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210908_062902.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/pomepopote.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/saxupuromubaf.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/makotaxa.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/bezinosefotatosoxotogu.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/97590714138.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/18420919814.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/69962092030.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135980711f95---xavinoposi.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/33142308.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/13119789004.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/8360821327.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/wevopudajoluvuzudaled.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210907155052145.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/39090990811.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/4f57c6093f5c2bb32745a2a6460ddb2d/48025158168.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/b097e1ec7c2b09cb532bbe62e68cd2ec/79880301962.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/xozosunu.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/xibadosumudofexokam.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/dabokiwimixubaxisafufo.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/puzake.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/lodageradedasolu.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/dojafuvojotumejitukagepu.pdfIn PDF document text
    • 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_off0000daf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 10084 bytes
SHA-256: 82aa37b32e47395bca42bf275ae5cad756cd9f7268da2a96f5fd36fb7ffeee3f
font_02_sfnt_off000109c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C3 18420 bytes
SHA-256: e23f94998c6cdf27168ca30d4f50157ceea338160aafd36405ec3312c924647c