Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4bd7ecc05e82ae…

MALICIOUS

PDF

85.0 KB Created: 2021-10-07 19:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4525fb1e3c3f34ee984374ac7bfb457e SHA-1: 170bdd90790bf521b9d6303bf6b4fa36d420b33f SHA-256: de4bd7ecc05e82aee4e07745642aa6ec74e1ae6c77105fbe6020c376148f0af9
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm designed to host or redirect to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a 'download' button lure further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ticketsperiodico.com/galeria/files/sarelido.pdf In PDF document text
    • https://granitabrasive.hu/editor_up/59061883478.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/19675808527.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/fuveguwaxo.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/nutifewutekomakovabeg.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/gadunima.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/xojuzizamuj.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/bibuxifenomizonolotoma.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202110031208599933.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161588ce8b8b12---70720311559.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/babarugoval.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/wekalotozijamom.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/rasijibabokoni.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161382abc2d485---30923268995.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/robuzajafeb.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/dabotuwafuteporetigojewer.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/mosenino.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161540b13d9731---pexenejoxabebiva.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e41c3e6682---busanezabedij.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/73701188664.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/bcaa4084b0dce01b3b47cc1bdcce6e96/69967976986.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/27574170617.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/71464039258.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///19091265435.pdfIn PDF document text
    • http://voijin.com/userfiles/files/gomogunoxaruvaled.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=call+of+duty+download+obbPDF 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_off0000e1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 20740 bytes
SHA-256: 5b0c4cbab7978f66856572312acd149f5d7455c593e3200e9b00f6fde1109bb0
font_02_sfnt_off00012f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F32 10328 bytes
SHA-256: 079f2fa19b00950572a1fc15fca278ab189de7b27de5551b40c456f59372e899