Malicious PDF — malware analysis report

Static analysis result for SHA-256 96d1a5bbbe14004f…

MALICIOUS

PDF

85.4 KB Created: 2021-07-15 14:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 46d422fc395ee8bd52ad9afc39f18bf6 SHA-1: eece9a8cd4c19232ab5e15ca79da0140557816f2 SHA-256: 96d1a5bbbe14004f2b167d4318b9a564c0d1ed8955f9aadfe5f4432befce4380
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading a password-protected archive. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document provides instructions for accessing an archive, a common tactic to bypass gateway security. While no scripts were directly extracted, the presence of embedded URLs and the link farm structure suggest a downloader or phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://medvor.ru/uplcv?utm_term=drawing+clock+picture PDF link annotation
    • https://kp-bs.ru/upload/files/61843244872.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/12e64548f81de8b65a0631913776bce0/mekukelixavalinilobigomad.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/80756455752.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/u818ckbjcnb9vhgkj14ak6o0t6/80499056616.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/dojagevob.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160818e064a934---3156406995.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a9ed4fe64---46480394934.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/60047426928.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/125771a7ff90ada3cf2e43f6294a78c9/sudepusuxomon.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/08af6eecc5945221eaf9bed74efbaf66/wawofifajepif.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/35qmma74hpotutadthvsn1esu1/63685022073.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160835450d80ad---jinitoloboposuxid.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/5804cc9320db167554abe779d365c42f/moruzamufiko.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/24f6d8e0ab0d0b17eec57bbe95e58b64/92927229750.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b573848dc2a---poloramexapovo.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/bf6a587ddd2e1716c3e19742dbddef8b/74200796468.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085dc846d24d---33066032126.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160727846aaf14---34378528186.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/55789640345.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/966022b5763c37e6fd35f32cf8c09d29/59341857901.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/r84ndgs3vnmaim5ua0cpc7chd6/salatasofisumowo.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/s8ck522qq7vrojc80hj657hjvc/81682745753.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_off0000eb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1A 10660 bytes
SHA-256: bdafa1aa227d139e317e23a214f39109b130ea4225a5b8572f88749f27e56322
font_01_sfnt_off000103b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC8 17048 bytes
SHA-256: bbba5b2e7b930d03c69a6719ea8a1b1332e2523203373cd975c9966b0de509f5

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