Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ee3bddece60a95…

MALICIOUS

PDF

95.4 KB Created: 2021-09-05 19:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4df9bd3813fcf3c67dc3044fae027590 SHA-1: 273584ef236897e9436363c862cbfd81d41662e6 SHA-256: a5ee3bddece60a9549296fa01049148d99e5307e415ee7792c5ab8f49b363d76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://infrive.ru/uplcv?utm_term=laringitis+cronica+en+ni%C3%B1os+pdf PDF link annotation
    • http://machin.kr/userData/board/file/17601392527.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa166ae81---nilitato.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/733033877.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/44804532a74be8742630fb35855cb93f/69139508540.pdfIn PDF document text
    • https://seikai.jp/free_images/files/zototuxa.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de2c089b86---79688109825.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210825_63977F81A8EAC1CD.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/77a958d50209c0510e43d2214eeb217e/76874921679.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3ec60f85a---32534243342.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/22790fe6aec4ee301e7144c6bf11c2dd/27080770787.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/puxuzixasedekiwajuba.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/xabufonapamidifaxisavime.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/95456470463.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/iooucavlv9c5jmhs2beg4oddl7/64211363747.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/13784812131.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021083013063986.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609691b2779fb---gibofelasenibumafesaveno.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/30439299454.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6d1f81e54---51424983752.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c170a026d24---58027704797.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d48900d13cb---rolerizivi.pdfIn PDF document text
    • https://t2sc.me/userfiles/31756781244.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611eaaee1a0b1---8394808496.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160decb7a7a4bd---43911284749.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_off00010af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001230e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230E 10912 bytes
SHA-256: a7fce112bd54fe39fe6ece65eda97ffbb1f6797362af15e829fc91375106d8ba
font_02_sfnt_off00013bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFA 19292 bytes
SHA-256: 4822991385ac0f943f0fd52fdf7cf5da9d538f8dc1f54f44e6a7b7e9b893c78f

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