Malicious PDF — malware analysis report

Static analysis result for SHA-256 85117ba60cef504f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 10:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 92e52594fe55ceb26e414fd145b243bb SHA-1: 989f7376c6e21c6ea5604faac7e7514e56edf727 SHA-256: 85117ba60cef504f763c46a1e84af747e1a186c8a78e768b7dfee33765de32fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=baaghi+2+full+movie+hd+download+filmyhit+mp4 PDF link annotation
    • https://www.carrentchiengmai.com/files/78867918470.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/51fe9d18f3cdbe45c8b4f02bf505a01a/daseliri.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/84295880523.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/79c3d3b002da39ab5a6c2444069c7e01/pigolizezojuwopolikej.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9a539298e---vefasorukowotop.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160761fc61be89---memej.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/57409346531.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/zawefakusot.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/56e6f23b85439fd33b3015c54db3759d/murevanevodoredibeseke.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/09l6h0i913s8e34lhdut5qoe16/majutevotonupobize.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0581713001619940630.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/19805826864.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124e00f86083---79143047493.pdfIn PDF document text
    • https://banghenails.com/upload/file/zobikobetiman.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/13213323054.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/10626047345.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/79839242086.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/95430530673.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/84227331479.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/gojenewolexelif.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/65432375571.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_off0000da31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA31 17284 bytes
SHA-256: 982016b1145061ec750089da1c10cd35f02ab6b627ed3a1366c13bca45074edd
font_01_sfnt_off000106ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106ED 11296 bytes
SHA-256: 249fc79051a84589052f6923cc42c56a0ea728df35a3e02aabcdaf0f4d4003ee
font_02_sfnt_off0001213d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1