Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1814cbea62c10a…

MALICIOUS

PDF

73.8 KB Created: 2021-09-26 23:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 24c75db7a23ecc2b6c1d72ce848a671b SHA-1: 4fa3bec1c743f346f94e4c2c0dfb4fd131444d05 SHA-256: bd1814cbea62c10ab4f5f783644d7458a09f799604e9047fb9ee595ee4051151
96 Risk Score

Malware Insights

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

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests it's a link farm. The primary purpose appears to be redirecting users to potentially malicious or SEO-manipulated content, rather than executing a direct exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://archism.ru/uplcv?utm_term=mobile+legends+bang+bang+account PDF link annotation
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f28047c789---jafuxamaxetemites.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/67980848259.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/dijomimumifodunizojov.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/26643725951.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210917123102_9grc5c.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/66091076882.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/22822899366.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/migomigezabofepe.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/dorigatixa.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/sofutenije.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/pubexine.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/39762381641.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5b48a2465---34104453123.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/jufewaporasatigosoriz.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ce8fa275c683e8cbba803a17ee17f6da/bikatitipomikefifa.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/84008704704.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee4211760c---fuzemi.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/motafuwoxik.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/galirolezi.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/5715112662.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210904042508698.pdfIn PDF document text
    • https://trieurodata.ro/images/file/wamorodafilafupafi.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/98761597815.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/47939594506.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_off0000b98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98B 10680 bytes
SHA-256: ceed81ca924b90ed5e978a13ba05d4f65d007c3d6328d915dfb3282232c31c41
font_01_sfnt_off0000d1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F2 18344 bytes
SHA-256: 8f87e7d7cc64e73e863eca9a2030e7c3b3736c09367dbcf6af3ac631742121f1
font_02_sfnt_off00010120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10120 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1