Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da02ecf0dd9d0e4…

MALICIOUS

PDF

68.7 KB Created: 2021-09-24 19:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 311839513e7a075d41541537359d9cda SHA-1: 7d864c94e2f0ae8612324aebe5a7bf93d4897965 SHA-256: 8da02ecf0dd9d0e427a397d07766640fa7ab46999a498ed9b368adc05c6f28ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URLs suggest a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wastran.ru/uplcv?utm_term=galaxy+gear+apk PDF link annotation
    • http://mnwebdesign.dk/userfiles/file/33187340382.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/redeguxunawop.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/5913705584.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/98ec1772027a6aed6c429c57fa5a24af/kurekumokofom.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/bimuziziledotemogita.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/nifalinawovisa.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/sirorenofopupifalikota.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/bizisefubabiregu.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/kelalifafudilekawewovaji.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/dukemaxamujamo.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/bfitmp0j45cn71df55igeuln10/zibivofomubumuwofe.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210901183450.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/19420366452.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/kixivakujor.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/96677864372.pdfIn PDF document text
    • http://envigest.cz/upload/file/dozibo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/t0hp8ilvvtbjnm937dts7ec564/98625743317.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/4245264153.pdfIn PDF document text
    • http://robbes.nl/media/files/59026739028.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/gabalip.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/juropabavopilanesas.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/temosoje.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/82535493661.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_off0000b121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB121 14636 bytes
SHA-256: 7c2c6b002e179ab05f466449181818d47a38ea149f1799907a6e91087af85170
font_01_sfnt_off0000d63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63F 10192 bytes
SHA-256: a9a0f41646cdad1a0d97504f40f78e1c8a64db9839d287b1bb951b29668392a3
font_02_sfnt_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1