Malicious PDF — malware analysis report

Static analysis result for SHA-256 2035d29cd99797a5…

MALICIOUS

PDF

91.3 KB Created: 2021-08-19 14:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 6bbc11c06801c71db45cda88a6028493 SHA-1: aa860756c86831f520af20b0c7fd2bd0f61af005 SHA-256: 2035d29cd99797a501cb650d42e97006aa5b79be6ff441fab81e156f2931d667
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to host or distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081429562afa---89966917265.pdf In PDF document text
    • http://mariancozma.com/_user/file/16741032481.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/fisew.pdfIn PDF document text
    • http://abpaluso.com/upload/file/31727008240.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/7129a84a6fbed1b7a04ad5c932285b10/44240980260.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd704a7d174---relijapuresumes.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/7438551122.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35302627113.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/cb3d7c95295391620b37d0b4a396bb7d/28829433935.pdfIn PDF document text
    • http://neteyes.eu/editor_up/daxusatirebesofa.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e00dc2591a---66436111483.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/83519020220.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/1791754237.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/sisodelosinati.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fd94da14a86---pibufupajatiti.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/lobidiwafijegokedado.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc11abda17---23630760510.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/daeb6aeab2f7e2b8d531645bf8a7299f/38205838364.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/19031559613.pdfIn PDF document text
    • https://tessuno.com/upload/files/60e2c7febdb75.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16096cb94a58ce---batisobukifavuzafevowoz.pdfIn PDF document text
    • https://giustofiori.it/file/jusadazig.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/83468299809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=what+book+do+kaz+and+inej+kissPDF 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_off00010108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10108 17864 bytes
SHA-256: acaab695e5779ad65d3f35b6e5bae47fb4c63ce4d18796bd6476287e344d418e
font_01_sfnt_off00012f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14729 10616 bytes
SHA-256: 630b38b1c1fd2b8f190854aacd528edec1f056acd5a8bc251fc79651e6cb405b