Malicious PDF — malware analysis report

Static analysis result for SHA-256 536edbc5c40d124b…

MALICIOUS

PDF

102.3 KB Created: 2021-07-02 13:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3bf64f0a2d324bc9159e5d80f79ec3f8 SHA-1: 4c66ff5be0352e784d8419bb69050d6c9b3b78f8 SHA-256: 536edbc5c40d124bde1c747434b7facd3f61de1ef092a6585e282b09ccd19e60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2153cedb34---meduwusa.pdf In PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/1ee475c330f34e715678584a52001098/17105316880.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/39239270652.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/95cb27c9eaa6092a6d50aac9e7092c65/siwafawikibujo.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6b4ce5290---vaxokefukenira.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/65480415296.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/56350146695.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/vipevisetarirezifu.pdfIn PDF document text
    • https://consjurist.ru/uploads/files/nafaxifilapakefixe.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/fovowetotiponavuvib.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/f1eb0f921b24cd0230abae86b27239b9/degirometolewurarafa.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/ccueidv51f41b41cordt2gmn94/zivilimixuzafu.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d5cc46c99---divenelerarafimufi.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b0e798ff7---78775322821.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/14598025703.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/47001311730.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084c463b8c50---lamevijoledimasidewijuru.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607071b2090e4---zalubatorubij.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/gapemugijobusek.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8ee0ef986---bujunujodatobiw.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/29462737219.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074c20fa799b---wabomelena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=latest+action+movies+2020+full+movie+english+hollywood+hdPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE31 25084 bytes
SHA-256: 8ff89e88cdba5f149fec6da32d4e0384ba2d841c432e52b6d2fd6ff0effc09e5
font_01_sfnt_off00011469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11469 16824 bytes
SHA-256: 7b806e9027e863333b6bc2835467ee0b430cddc072ed492f5c4d7859fb32e70e
font_02_sfnt_off00012c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0F 11388 bytes
SHA-256: 683ceb391a532bbd9b834a3037209ae9a87a902f3948fc229f144d8238f89b24
font_03_sfnt_off000146a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00015eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EB4 13072 bytes
SHA-256: 3c981ee50f30da9d6ec91c26f40d994b10c55960fdc0914b00874afa9bd3f4db

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