Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5a5e41899a1114…

MALICIOUS

PDF

86.5 KB Created: 2021-07-13 17:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5b6f4fc81410b8be353ea1b49892383c SHA-1: acb0946db322bf074aa91897a07ea5aaf114a957 SHA-256: ba5a5e41899a1114c283cb057542beed9aa20ddbe1ec88b8b5ba39944d415815
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and utilizing disposable hosting, indicative of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/57vsbhg2cd0561nmbcdlct1633/85412971804.pdf In PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b0f081ed5---koremonipakobi.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///soputexul.pdfIn PDF document text
    • http://etre-belle.su/images/file/25812557687.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098bf0b864f9---zugopijudimi.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/rixorinanotovexutu.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/0042c7b8ba3d8124021faae10f73a010/remesomegenolab.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa029f1b1b---dalomez.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/83322943002.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a612e73dfbb---tasuvofesij.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/nekos.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608798c26012f---zerepofokorikala.pdfIn PDF document text
    • https://artbynela.com/uploads/file/19558035630.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/jeloju.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d515c7560a5---dojafejiganasatuta.pdfIn PDF document text
    • http://berbun.com/user_img/file/doralujifasonu.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/tumegagux.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/24120809324.pdfIn PDF document text
    • http://reflita.lt/uploads/files/fafekasevel.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c593f113d52---59014930578.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/79771542900.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/66052171868.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/16d4ee684ebf39599bd0bddeb00281de/bikujafusora.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/63e852129e310e2fa0e3e2d4df76041b/woroxubivu.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/90052179679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ashes+to+ashes+odyssey+questPDF 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_off0000ed20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED20 18092 bytes
SHA-256: c65de2457c2c8cad53cad31f6bc14cef2d7755d6f81e5c75e4a359f430ea8f05
font_01_sfnt_off00011b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AD 10344 bytes
SHA-256: 1fa06940af5a52a09f8ed5bd9677b0d150f8c18729e29391e72f1d88e75840f8