Malicious PDF — malware analysis report

Static analysis result for SHA-256 496f86470be5e9c8…

MALICIOUS

PDF

87.5 KB Created: 2021-06-28 22:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5eaddafce2bfbb7eb2040b6ebfe8a378 SHA-1: 0ca94a4c8d53b6f01eec1bd4a17893d64bf0ccff SHA-256: 496f86470be5e9c89e80a385d9eca6d97a4b991073d0e7cad20e195a3af46f5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The heuristic firings indicate it is a link farm designed to direct users to external resources, likely for phishing or malware distribution. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=export+pdf+pages PDF link annotation
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/c41d755bb5bbfb283182c89bd274d238/fubudagenanexideputepi.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b0f380b3---99649971853.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/69255209139.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/kexujuzobivonepimedal.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969276dda4e---bemijikepuwateguvidijefij.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/buxarewos.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ueia91a99rmampevrnqfnddo6u/51411693628.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/96787246297957cd6eb13c9434a65f8e/mezitodiwonunipa.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/dironodebubavi.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc10211068---79057597235.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/20135053743.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/12c1d4d904cefc5b5897b31e408a63d2/24236246992.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/61932c6206e14a4ba4331d244e02d9fb/6053411601.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/etkadco5luhk43v0tg3b6o6ohg/120427449.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/25820315964.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/t1qja68bhg30kq0jhuchpn95qr/2639142173.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/4b0b97ad7e7ebb019fc84b2fb9a9a482/93318598342.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/86326950479.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/48535619022.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770b2fee268---96237281626.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/9skmr32vlker618635br7vrvhd/tejorebivakoresiput.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/sjpf2lukl5u6jair6vq38qo6bf/wisebeboboxi.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/58081b7e45d8e7dafe0970129760f657/20673882043.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/erajk9lj29fo5oqengqmtmgrrh/26311374997.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/roverugeva.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_off0000f1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 10516 bytes
SHA-256: 22928d3f1474b5ca651d3fff8f4f30df6af09a407c8a163874b1a2c4cb055bc9
font_01_sfnt_off00010984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10984 17888 bytes
SHA-256: 12dc3f82c4dda67b2c72249752aa45bb382e70c6d7face5a3366f9cd054e07d3
font_02_sfnt_off000138d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1