Malicious PDF — malware analysis report

Static analysis result for SHA-256 4250fb53c7c02b9c…

MALICIOUS

PDF

89.3 KB Created: 2021-09-04 15:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7e5fc3c2a1cdc29b421f3b153f024680 SHA-1: 387f898a5dfbd3b37f174b15dfa0f7360e560fd2 SHA-256: 4250fb53c7c02b9c6595a393c253e74a7d1a5e64f152d066dcce09b2e606db44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072724801812---89709452051.pdf In PDF document text
    • https://majubesar.org/contents//files/vafunajuki.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/74148111725.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/tadefituzile.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/8460ebfebce8674eda4f21fa08695f81/97176504205.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/81211803862.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/mbi1svhhp7e8bq0qf9cvvl8qf4/kekizalitu.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a13cd0671---fuvuwikufafewujax.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/i9oksaj5b29vse75kce79125hv/bejaxoturotaxewiloraviz.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/77568640740.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be999ee2d4e---37593372323.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c538f664da4---wudapubetawumorup.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/16029665526.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/zurugape.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/govoxu.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/70687044619.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c47fe6a9f---67229397703.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/pobepanikutapoxir.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210603_D780556495533F5B.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087158d9228f---86378940204.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/7bbd5b90d32e82fa5fffd79c2382d246/pudimukumoju.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16124bac5d2b18---piwiwesizerininumujirofiw.pdfIn PDF document text
    • https://emprenderem.cl/files/nerefazepekubevuzu.pdfIn PDF document text
    • http://nineslash.com/user_file/file/lizimuxumulofogedirewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=embolie+gazeuse+pdfPDF 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_off0000dea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 18448 bytes
SHA-256: 815351e4afbb756420e5e288c90a965c0c0f1c0ecfa158629c5d5d90c5d89de6
font_02_sfnt_off00012586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12586 19724 bytes
SHA-256: f9e840daa6deb329f2b9191bba7f01585dbed9778624033a1949ea1e5e3d7c0c

Open this report in the interactive analyzer, or submit your own file for analysis.