Malicious PDF — malware analysis report

Static analysis result for SHA-256 925921bf87f1a106…

MALICIOUS

PDF

120.2 KB Created: 2021-07-26 02:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bdbc6461b22bcca0d2b0e20034611804 SHA-1: 35f6acec7f6162627936999430851f900d1d123f SHA-256: 925921bf87f1a106e1a378ae739871b71270b8cc3eea6ba117f2e05b09737614
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript, which is often used to initiate malicious actions. Heuristics indicate it's part of an advance-fee scam, likely luring victims with promises of prizes or funds requiring payment for delivery. The document also hosts a link farm pointing to compromised WordPress upload storage, suggesting a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/gu0jonbfobdvo2sdhafbdnhu86/28091785272.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/loxavigufoliketuvozisepus.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/b191692b48b6050a51cb1b8430b84633/kimuramebulilozotasuf.pdf
    • http://maychamsocda.vn/images/userfiles/file/matapenojapurunufasuzor.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/radcvjpj1idsfqaqeri1qavn79/zagutabika.pdf
    • http://al-bandak.com/userfiles/file/zivazuzutelewakewim.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1kjhqdn0bh5s98ndnrmuacdmhn/pakukoren.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/fd9fa3ed06f8d5cba71c52ea08c02700/saxar.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f217c3f774---witobozasidodi.pdf
    • http://ibb-online.ru/f/file/pejoda.pdf
    • http://choinka4x4.org/cms/files/file/jabanujimujubuxi.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c256d5564a4a09a9a7488b1cfb714e7a/zurepuvuzoxoxemevu.pdf
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/5e6m3rsrf4khskdhv7l7etpjct/givipor.pdf
    • http://www.sport-konyv.hu/userfiles/file/webaboboxenevokid.pdf
    • https://cakenepal.com/userfiles/file/zobozunokijepusexito.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4792d749c3---923300.pdf
    • https://stvorki.ru/files/file/92945483111.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/276e8cfe51a82830c2ebd0fcbbfade66/damibupuzipe.pdf
    • https://pecsikult.hu/files/file/dusukatasurogalovuvogikew.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071bac80d07b---21118549874.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/7bsgi116ps1sq0a2o9r172i38h/gelitabepaliwujubisoro.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b1e16d55e---nusis.pdf
    • http://fly.no1-yes.com/userfiles/file/57189028577.pdf
    • http://carscaso.com/js/upload/files/wifisuvobubagupidovize.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+are+the+biological+theories+of+crime
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001742d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1742D 16792 bytes
font_01_sfnt_off00018c3f.bin
bd4c40699538247883c7074d91051fe11d4c7fa4f761103e13585cdac92ab2f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x18C3F 17344 bytes
font_02_sfnt_off0001b937.bin
4203ac46c075e7fedd7c363812cbbba8e2c798742afaef3b4ba601fc9eeccacb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B937 10812 bytes