Malicious PDF — malware analysis report

Static analysis result for SHA-256 b142f4c9cda63491…

MALICIOUS

PDF

87.2 KB Created: 2021-07-03 02:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a6221df1af8e9381052a728d82f80204 SHA-1: ceb3efe446346a660aa268b5740c6b3a1b75b39d SHA-256: b142f4c9cda6349126e227e3f264b6684f4e062e2d943c9adfa7666211399ceb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to compromised WordPress sites, suggesting a link farm or SEO poisoning attack. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of external URIs and link farms on disposable hosting. No scripts were extracted, but the primary attack pattern involves directing users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=baked+shrimp+and+scallop+scampi PDF link annotation
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/b44d0c9c341780ef0204ac38622b2d40/21603094651.pdfIn PDF document text
    • http://houselandia.ru/files/8333728525.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ea8fee899---robejebura.pdfIn PDF document text
    • https://ms01bet.net/contents//files/73671787073.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/563032881ca612dcdeea5fabecafd284/wemuvugaxafepomax.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/1c7abc3c0ce68238bc502aef6ae4b8a1/vororepibutesawanugowuzet.pdfIn PDF document text
    • http://boxethai38.comupload/file/lokiluzivoxuvupe.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/e48919f268903ed107e8106adbf33a33/fenabazebarirug.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/3koc9374r6av8fu6ijdtbg2av1/45845228817.pdfIn PDF document text
    • https://andrejc.si/files/file/14192308526.pdfIn PDF document text
    • http://hzdshg.com/images/upload/File/gemisewipubulot.pdfIn PDF document text
    • http://asfalon.com/__files/file/kazadoduzurezimezexogum.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093d4b738bd2---59201695105.pdfIn PDF document text
    • http://placc.info/up_image/posadoguw.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9a49d4ae9---laxusux.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/38597513157.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/350825f1c31465404253ea93bc4adad3/8717909063.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/79725322732.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/b50cb84cb6db4157ce856e3d4066fd1e/rataturisiwibozaj.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb2480ce9e---16506353113.pdfIn PDF document text
    • https://trips-in.com/ckupload/files/92493418402.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/getodefuvunudobozalaz.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/42c7f26b4ab181844793238a882bc433/82742152141.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609025565f6a4---zejexevemaroronusutavog.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_off0000edb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C8 10824 bytes
SHA-256: c62571459d193054d99eb966de132e1711305be7c19e825dba3405bd43e25e63
font_02_sfnt_off00011e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E86 18500 bytes
SHA-256: 0a7c3d9199db8e28c301ae10cdc8b7106ef3041344f0eb535d55a3aad85e841a

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