Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db5b8c32a8d6b52…

MALICIOUS

PDF

79.8 KB Created: 2021-09-01 13:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ebf3ae4f34d3d34a6a3834e8e1403d24 SHA-1: fe6b3afe10bb9a702d9581e12d098ec0708f5d93 SHA-256: 6db5b8c32a8d6b524d88c12e3d802a63e231b39efe98ead3afc4fdca6a3a1a12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The embedded URLs and the nature of the link farm suggest an attempt to lure users into clicking malicious links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16079b0dabbf72---geporakedebuzewoma.pdf In PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/349fsdrl5imjfie46sboug69ff/degeko.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/pitepoxasodupu.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/kebako.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/9k7lreohflngmhljvcm3rcrne0/67232345656.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc6d0ec5f4---9944197058.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/sawudizopasavuwinurobomo.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/87863174951.pdfIn PDF document text
    • http://gtshotel.it/images/file/soviposubofitatede.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/takif.pdfIn PDF document text
    • http://teaandtiarasmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/1291416756.pdfIn PDF document text
    • http://beateromer.com/bilder/file/fukuxenogaduvujukuf.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22f9de2556---liruvodonolemaxekaguturon.pdfIn PDF document text
    • http://hyderabadibiryanicorner.com/admin/images/file/kunupuv.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/bosemubulujelo.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe49f3d9e2---fimuvifepinimozi.pdfIn PDF document text
    • https://limsurempat.com/contents//files/bukixawurorewuxozi.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/demepaserilo.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/50480110915.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea7f749259---zuviwovun.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609450fa75dc1---melaxubevefoparike.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/kewenarelor.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a8aae6e7496f4fc67e4ac7645fa4c0a5/dunibajurijirefi.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c937e113e---sagelitavasejuguxunu.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/13ovu4aourpm7o4hart01kdf77/bulodanepudaboxemer.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/0orhi885pbkl3v1fk8rqbf2ojk/33135305768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=releasing+your+potential+myles+munroe+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_off0000ce1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1E 18420 bytes
SHA-256: 734ea9ab1d82461c4281f87b6d1f66b05eb15dab25ef5f579db9f11e9c258541
font_01_sfnt_off0000fdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB4 11100 bytes
SHA-256: 6101ca12ad369b4fc290782f1df39b372dca54b2c81af52fa40c0cddf4852f8c
font_02_sfnt_off00011768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11768 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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