Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa4f65d7c4ee3a8…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 19:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 37516f96fd24a3c59cbf8a0bdb9f58d6 SHA-1: 2e6bde7d7d6483f733727c85ae71c4cfea7ba264 SHA-256: 5fa4f65d7c4ee3a8d98ae6ca8ecc7ffdeeb4ddb3a7738822540a88bb2cdec28f
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm pointing to compromised WordPress sites and disposable hosting. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates redirection or further malicious actions, while the link farm serves to obscure the ultimate destination of the user's click.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137a04d7ff7a---fisuxudovibenovinewutelik.pdf In PDF document text
    • http://client.diffuse.info/files/menasatetodizijokezobo.pdfIn PDF document text
    • https://norservis.com/files/files/90639153562.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/rewatutejurakidowomos.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/wegazobudonufeso.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/95528216502.pdfIn PDF document text
    • https://peterdegendt.be/file/retexanobepin.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/xuwagubulabuko.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/xapowimegorapak.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/katuze.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f300ccae81---befubegewadinatizolapux.pdfIn PDF document text
    • http://meta-min.com/files/87736291798.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/17384487871.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/wutuj.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/36098043235.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/sogonikutabulina.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210901224332.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d7b3d67df---mituxeduxakomifegipuxiwi.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/67648471950.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/zalawux.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/jegekuratujawonufus.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/276538475.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/6994621677.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/1040725865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=android+partitions+explainedPDF 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_off0000d11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11C 18368 bytes
SHA-256: 712bade9475fde282fbdf407c17e2e0a43e46845ae72cd2ec067102ed828d5ce
font_01_sfnt_off0001003b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11852 10468 bytes
SHA-256: fa49a1951f6f2b495865d061a6e1d55e074851dcbd9bfde2b6d1cae9c69277ef