Malicious PDF — malware analysis report

Static analysis result for SHA-256 e527d6afd1f5fda6…

MALICIOUS

PDF

74.8 KB Created: 2021-07-07 11:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b5ae6309e35724fdf415ebdf366374ff SHA-1: 52af35a821e6f61d7dbdfbe1d7036cdae41b9d19 SHA-256: e527d6afd1f5fda6e7d23e5474cdaceb334d10fe95ccd741435a8442ec42e266
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous links pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malicious content via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16099d3d97802c---gutanuzonajodezuk.pdf In PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/3cc84558786682f5f5cb1d28eb7e64fc/lagisibupiboket.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/46108711007.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/26995373827.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a34df07cfc7---98833220506.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/8f05oj6qajbhlmc179u1u7che0/pemakulelafixexata.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076acbf9d1e4---29953880565.pdfIn PDF document text
    • http://motelandratecuci.ro/userfiles/file/tojawokumofajize.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/3c5622b9ef002e62d703f8816a7ad2c4/lizafogufugidivawa.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/5e0th0q1eos4ltmrugs98eegu7/lofibezusisidadepevomasu.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/30016446631.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/xinezusavoxagu.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ab3c557fb---ninivudesok.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a8b56a134---34953270658.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/mivogebupixenatavavemobif.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a50a0ed2de---vogizazoxekozoriboxun.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/nisamegafuzisebujida.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/muralidijajivodumolo.pdfIn PDF document text
    • http://grandviewheightsalumni.com/clients/79364/File/dodiregebudazatetopipoxum.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/69780525715.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/skoasi4n8qu9m9v27sbre1cvud/85528771221.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8356ea08d7---52237969101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+insert+calculation+in+pivot+tablePDF 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_off0000c44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44A 15816 bytes
SHA-256: 3bbd7cc6fee42689f11ed2c1d79195ee1938533dbe4215aad671b508c6a78736
font_01_sfnt_off0000ed39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED39 10752 bytes
SHA-256: 6b19706dc5038c127712a22c056539b779c4e0cee9b2ca9355a29491dfb8ee3f
font_02_sfnt_off000105ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1