Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8aa896313c176e…

MALICIOUS

PDF

96.9 KB Created: 2021-07-25 01:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1b2f2515843ee56d63be9abd9f283f84 SHA-1: a9ee486e6ebd9a9ceb5abfc486ab4f10f804ed40 SHA-256: 3a8aa896313c176eb2657c79c91439f070fcb6c4af4b8611a3ba0fdf260920bf
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a43a52cc18a---xebujumorugo.pdf In PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/89a97c6f989f6510fa415516eb54ac2e/bakujiwizikukojedufonow.pdfIn PDF document text
    • https://go2germany.ru/files/file/2776217508.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/ba18955d193c81b8020061b7296c0d68/32842121764.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/67359999261.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbbf48dea65---jesoruxakejeralazokukiga.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b8a5afaec---42987740219.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ga6b2pfl9jpgit6jv951djto9t/75345783329.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/xanasigokubo.pdfIn PDF document text
    • http://slsnn.ru/content/file/26875822799.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea22d3e25f---85877329172.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b99635384a---7090560567.pdfIn PDF document text
    • https://unosms.us/userfiles/file/41443461169.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a3509291653c1e4aa684e5fa36f50801/65158217760.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/rusubigelufigojapegutab.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc1bfb92af---zabobumuralipu.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b1a67b466fdbfcf09123d13eeb5e2d0a/rutaf.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/95535125835.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/cd3fc5bd97d4fea47f7a977fb2071bcd/26990110401.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609489621091c---90565364652.pdfIn PDF document text
    • https://botroul.be/uploads/99782451626.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f056a791ec---13074939647.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/6d0dcc136aa20904fd1bef0f14d150c7/39622277990.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/32367971934.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210621_27C1BD45616CC881.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/i9dfrl74o45hio2kmmm0dc8et9/kenenepapewozulosifixex.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/muvojeroju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+much+to+buy+a+kfc+franchise+in+south+africaPDF 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_off00011333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11333 17344 bytes
SHA-256: f187faef1d9c27dc53f60e2c026e4145d05115de1ca491e92b9ce86efade7055
font_01_sfnt_off0001408f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1408F 11080 bytes
SHA-256: c90fd6843794ddc3c84e5244d4629acd49c8a0903545ac5707e371a600c77d3a
font_02_sfnt_off00015a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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