Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b658339d6418fa…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 18:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d875bb6438315c48b8fbfa94fc676d2 SHA-1: 6a98b0ad4cac949f1964011990e2fdc71a8ff0ad SHA-256: f6b658339d6418fa1cd0890594fd08328f39a7ba17988b5c5d2ddf3f82699b57
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://huntic.ru/uplcv?utm_term=watch+the+bachelor+season+17+online+free PDF link annotation
    • http://spiregene.com/image/files/20210913_024522.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/tojasatovikawepenavak.pdfIn PDF document text
    • http://terrietanaka.com/library/files/bijeladirawinuge.pdfIn PDF document text
    • https://aitalk.vn/upload/files/voxidevaw.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/pebumome.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/62539000846.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/76681543766.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210915_083713.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d98e2d51---50075654727.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/24356145193.pdfIn PDF document text
    • https://novsport.com/content/File/66008151842.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613397d06ef88---45494408607.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/mikigijexedevezurixe.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614226e8db3e8---vomameki.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/teduwu.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/69e0e9bc3af0e0f62cc587de2c2b0da6/14721742537.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/38317772901.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/40953612172.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/95906735838.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613394b3253dc---fegig.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/toeanqcleo3v9d4h7doq72vdj4/5515197161.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090305555316.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_off0000d9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F6 18504 bytes
SHA-256: b48a2876e5995031b0c0fdff8c9990cf91dd04379e36a8dcfd97e9a71a5192c0
font_01_sfnt_off00010a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A13 10668 bytes
SHA-256: 495eb21a491fb374e1e2125bc82b85c42879437848731482680dc9794a6b2053
font_02_sfnt_off0001229d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1