Malicious PDF — malware analysis report

Static analysis result for SHA-256 655967aa2f8fb5c8…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 14:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a296adc7de6d6b50cf8718204131620c SHA-1: 95cc49bfc2cff46bc49f4dd3a71557d83fcce6f7 SHA-256: 655967aa2f8fb5c84f9fb9beaba1bc3232755cbc42fa9eeb88c3e3a97d1a73aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://pistant.ru/uplcv?utm_term=genshin+impact+april+redeem+code PDF link annotation
    • https://savitravel.ro/ckfinder/userfiles/files/74944574256.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/14869757982.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/hl65h9l98370cj1pmhlststge4/97306794651.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/xutenep.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/96323220485.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/70600561415.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/93073245892.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/11154236627.pdfIn PDF document text
    • https://kimansion.com/uploads/file/faxifelusowarelakeb.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/18924877357.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091015133073499.pdfIn PDF document text
    • https://rcot.org/userfiles/file/17661497178.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/mazowolexogilanoxadal.pdfIn PDF document text
    • http://julianina.dk/upload/file/57747886563.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161403a2957a0c---nebatobaxed.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-9/20210909014610721263.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/fagidotisivovabuwuforid.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/8410039317.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140375b3091c---19980948362.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/xebevaje.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/40952644886.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/87940670064.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/kadoraroja.pdfIn PDF document text
    • https://ibextrail.com/editor-images/68594769867.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_off0000d6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 17172 bytes
SHA-256: cbc149b472069ea2f7cb711b9c58410e678d7b3aa4b76f6beac2d73ab1a9835e
font_02_sfnt_off00011b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B64 10816 bytes
SHA-256: 60aedf482467ef05ee0129ec16eb8a4008f647df78afcf6baf8aa479ef915fd8

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