Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48a293fca132a46…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 14:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5f4bc911ad71ec53d43d49cd46e24b13 SHA-1: 8d2048a27fe2d243532ea1e4bb031b45ee7cdb67 SHA-256: b48a293fca132a468f328cfd56432fbf44525b6fe9052b4c7b5f33b1d0f2cd13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute traffic or host malicious content. ClamAV and ML classifiers identified this PDF as malicious, likely phishing or a trojan, due to its structure and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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.
  • 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://torgradio.ru/new/files/file/budiwemo.pdf In PDF document text
    • http://insureacompany.com/userfiles/file/32654957713.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/23fdd11651feceef34b9a05c2d8debc1/gezej.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/fajuderowajarilidekelufaz.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/5ko831943r110huo937ohu3gam/4850935317.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/81559518320.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/n6mjs4eulnbb4841g5m1vvcrfo/47449799735.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4f213715b---nagekelujukit.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16103d7addbdb8---2269523180.pdfIn PDF document text
    • http://naviway.su/upload/files/27320980520.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb068242d8---bumadupivu.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c44605ee84e---fukepiripi.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be41aaf302a---56217312549.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/435db1a39d90f8da214edf7f506bac3f/bolilinumumaxagimoga.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/69adcd6c277024d963d5b12fc63d5a12/96454589626.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096e61b0dbe4---99175209503.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/90257108103.pdfIn PDF document text
    • http://art-ball.net/files/file/85099585863.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078768d3480e---dimawelevu.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/li06n95otl4uje007kpvjdaorf/87703254265.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/10d8786d5698e3d20dd2984309f37566/69829664991.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/texinanog.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/vigojufoteguti.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/varimaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=procrastinating+because+of+anxietyPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF31 10924 bytes
SHA-256: f82523f72b6011817cf3bd3fd51d7e164cc9b95fa647158a49dab6393b555c0b
font_01_sfnt_off0000f8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D0 17352 bytes
SHA-256: e2bb9357253feb5df1e61a698c278c70497b064a8cc0fa93ad5cc3e02dc12759