Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d423d11cf34491…

MALICIOUS

PDF

74.8 KB Created: 2021-09-16 11:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8a662c5a5a06fe2f729856f3afcfa3ae SHA-1: 7ffcf9d3c7fbe74e5e6c6f0bdb1176023674bfc1 SHA-256: 22d423d11cf34491e7a7e8172beadf577c7675bfef6e1324cbfc8c68cceb7ae5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further payloads or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://pixomot.ru/uplcv?utm_term=five+nights+at+freddy%27s+vr+help+wanted+free+download PDF link annotation
    • https://aqua2go.pl/galeria/file/tivelebojiweludurab.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/jakebojaxuzitewo.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/lokiviwubewupoguwenejibiv.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/sukufow.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/59794500241.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/3498747821.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/cec7e0b95ddc3d3855cfc19ba414a6d8/wisukorapi.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/64591581795.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/kuwap.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16142c4652be7c---zovakarepez.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090401475573499.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/jolufevarafu.pdfIn PDF document text
    • http://tdbm.vn/upload/files/14383762186.pdfIn PDF document text
    • https://path.mn/userfiles/files/tuladunakeliji.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/xozamipizo.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/fupufigajun.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/18484728685.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/botasupesisukoni.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/67653123882.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/jufave.pdfIn PDF document text
    • http://ort168.com/upload/ckeditor/files/pikujoresup.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/17173252068.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/tixukudekenude.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142a781dfe5f---xibesuxamubaxa.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321d74dc570---29233763934.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/dotupegewuxe.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_off0000bf2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73E 16964 bytes
SHA-256: 3f4be798164a2f0af7ddb38762565216c3c2e7ddc90a7f4486fbb00ccfdd4fab
font_02_sfnt_off00010375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10375 11052 bytes
SHA-256: 523286f1102162bd58d1456f706b72aa572e61f247ecc4a3e2f89c357f4c446b

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