Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdcb0a11d063b907…

MALICIOUS

PDF

83.7 KB Created: 2021-07-26 02:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 301fbdc52458d2f9fb67d5946868b03d SHA-1: e901067d2a8e9e68d212fb3dddb1a5b9c4b1f83d SHA-256: cdcb0a11d063b907d83aeda1ca48289c620a76ba7038a25da2edb5af7f439a01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish for credentials. The embedded URLs and the overall structure indicate a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://bensonlandscape.com/editorData/file/pamozulupamoru.pdf In PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3f95f0dd42d5f061c9dffe1ac96d5d3d/ruduwemilive.pdfIn PDF document text
    • http://grabnerestriche.at/89621339332.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/1d964a4ecf8ecd7bd0caf53db590e827/17012005549.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef6b9d58e2---xovobigiwovedudulage.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077d4efef782---wozota.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/kfoq9lmmbu3p31rimnqc0n5cmp/wozamesebovivikuxeni.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0c13584b8---66080985602.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/ec5353396b01c04f5f8b7005bcdd4211/52433468545.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/tedimofinaxitokuj.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/tozolamiguxuve.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/828135030f29239c98407602d3b06c7d/66438028725.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/jeluvafi.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f0775e7a35a---zalin.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f24617e52---sesesufuzazelazefudu.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/21654656166.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/04e7380ed79fbec6432be63a9bbf23a4/tupolumujab.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d97e761d75f---gosifilad.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5a2078c6dd7b83f610bc193d08877ae7/gekikitoriwuka.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/butanujugumedegigadavip.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3b7883de7---32817633800.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/43525370734.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d3d7abe236fbbba44afdf17c593c4b31/vodotewura.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qut5e104blhla0fvenfoim1ca0/zogezopawegixot.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/futizuga.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/3229502847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=2000+chevy+cavalier+repair+manual+pdfPDF 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_off0000e3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AF 10924 bytes
SHA-256: 3315a8ab29f8cada0d5105bc32b8e5e4e2413cab25d4dbe62a7b1d2b549bc55c
font_01_sfnt_off0000fcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCE 16644 bytes
SHA-256: e7be8f53f88aa241f7ec93c8774b94bb9962e45475277c9b7677e3e3af3ebba4
font_02_sfnt_off000127f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1