Malicious PDF — malware analysis report

Static analysis result for SHA-256 28df3ea932252335…

MALICIOUS

PDF

89.0 KB Created: 2021-09-04 16:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0aa51315e7bed7b409088117a529e7c7 SHA-1: 3deb1fb95d9a25ad9ff947e67ff6791179e49f5d SHA-256: 28df3ea932252335483015a3db751d37b6e1e1c91dfd65c99b219cd079a18405
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites, suggesting it's part of a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely facilitates the download or redirection to a malicious payload, while the link farm on compromised hosts serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160871d81e1610---fidigugusapobu.pdf In PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/3b406ad6035e0b2e75cce096c3f2933c/kanelevolo.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/xanafa.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608243114e4e1---70559148742.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/diwekow.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/6b80f5dc97b209957301f9a9ae456519/pamabigigiboduwakus.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/prkasb1gl12br2ctj3e6441if3/3127389133.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792f158d796---92004823025.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e49d79deb0ecc3b69d570e6d06330d89/3858622838.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/wilotitomowut.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/eae7e531fdc8fdbb4ab30534902773eb/82805166782.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/67201965201.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b857a1082---vakudajadalesateg.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/48396346053.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/47189120173.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/99b516dddcb82d22c1a5d133aa4374bf/mukevubidolumazonesi.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/84919390985.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/96913261021.pdfIn PDF document text
    • https://medpressa.ru/files/file/92074988491.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/liramofulorojogewigu.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/notifuwasimufepenijur.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/85ed5819024005bf742f2c88a3cf81ac/bitejixa.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c496370f24e---bazebolibuteworutamif.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/40823623313.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/98426087258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=manual+dos+padrinhos+marsala+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_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 19076 bytes
SHA-256: c5fe5db7358693d7fbac5a97c90284ce1ee4bb36da17d4f4202bb22a839f0ec0
font_01_sfnt_off0001246d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C84 10628 bytes
SHA-256: c5debf69a71aff2b141b3971b412d42be1cdc5aa9b4f24c667e37249b51049f0

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