Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9bf24eb96398b56…

MALICIOUS

PDF

93.7 KB Created: 2021-07-02 14:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b8158890e42b77107777f3ed492edeb6 SHA-1: 34512fc70f81a0954db21a9530b1449b80723e82 SHA-256: a9bf24eb96398b56da91db576af86668b7e1406ed59746c017d0cea6b62fce66
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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.
  • 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.
  • 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://huntic.ru/uplcv?utm_term=david+mitchell+phineas+and+ferb PDF link annotation
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887fff6dfc9---velegiw.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210614_11978EB7CA0B4562.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/2lkkn3eai4p0ktcc926fq3ipfb/52606945167.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c970ef51ab6---70059648025.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607119681a18e---fowekufotufegobolove.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/timaposevolojexesom.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/425s45m16ll0ocor99f3ppdbqe/9439326593.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b53554668---81085784162.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/23179510893.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/29638104191.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/rarakeluvunugusiwefom.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/ribotuwun.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebc7eba89f---samabugi.pdfIn PDF document text
    • http://caramelitos.sk/files/95304841199.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c924fed44a7f8f3154d760f6abf4d0d/puramexeka.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/nivopares.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608044ba4582e---fumiken.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/61685698859.pdfIn PDF document text
    • https://congchung7.com/upload/file/67684539062.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a83dc61a54b1a92fff5027010bf404b3/kizetetop.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094c88f7a724---digusa.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/lulawojulojazeginizelu.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16091bb225bc27---jorikupexafofigitominit.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/82561471453.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/79440539220.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/20713188995.pdfIn PDF document text
    • https://plasy.com/uploads/file/tamavefixemikufujumenapiw.pdfIn PDF document text
    • 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_off00010781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 10972 bytes
SHA-256: 56e6df8b5db1b29bde3aa988eeaa412901aa04d423aa0b1e3df19741031c5c76
font_01_sfnt_off0001208d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001389f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389F 18552 bytes
SHA-256: bf34ff966cd68978dcbc9665368165628142eb77df1c54da02d75f536250c57c