Malicious PDF — malware analysis report

Static analysis result for SHA-256 04019cbe911cc805…

MALICIOUS

PDF

101.5 KB Created: 2021-09-06 07:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7a363f6894d626c2995fc3b46cab7551 SHA-1: 265f7690f2068cc936715a53d49699253474eb66 SHA-256: 04019cbe911cc8055c88ad2491b7ef84678bc63bb3327ebe4c9658dc82f3bc82
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to various domains, some of which are associated with compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://archism.ru/uplcv?utm_term=pictogramas+para+ni%C3%B1os+con+autismo+pdf PDF link annotation
    • http://inimtrento.it/userfiles/files/lelefagikuboxit.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/lebox.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/wigogakaresisavudaw.pdfIn PDF document text
    • https://ttnthailand.com/upload/userfile/files/wunurof.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/95613573432.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/dusufabavagudob.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/mujumowenuzomozomo.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/43603271881.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cde03d9d6---29058724376.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/92961917479.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/85581236706.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/54426531583.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/156940615160ad9391ad584.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/feluwepi.pdfIn PDF document text
    • http://berbun.com/user_img/file/bimuz.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/90783621011.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/3669056963.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/99714307249.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951bf225bff---49001969801.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/kukufabijux.pdfIn PDF document text
    • http://teaneckhs1977.com/clients/67867/File/dezom.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/63766321981.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091705179492---15547992964.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/9micqfpkqh5ek87s1c7r1nhn2r/rolarobavumufetegam.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_off00011e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E02 11092 bytes
SHA-256: 71d545bab4f4752d728de39994a33f29e60460229310c05c51a541885b1d3c79
font_01_sfnt_off0001376c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376C 21356 bytes
SHA-256: 33c5a47c34cf5e26ba0858310e89b1cca32435b9f343d1f256b9e1068cf90cee
font_02_sfnt_off00016df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1