Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfe41e4d0e93772…

MALICIOUS

PDF

74.7 KB Created: 2021-09-18 20:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aec146ac6ac719519dd836f8b6245a70 SHA-1: 021c2910ecb7cb0a08e4538b363a722c09f623a4 SHA-256: 4cfe41e4d0e937723404d23c981e8b30a534eab529b80835d9ac28fb88b4bf38
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness, and the presence of external URIs and a download button lure further support a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=aravinda+sametha+veera+raghava+full+movie+movierulz PDF link annotation
    • https://digicpictures.com/downloads/mamajotafa.pdfIn PDF document text
    • http://tzsunup.com/upload/57327116240.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/bunibulinadawevogimimagi.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/jaresixido.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/79478625796.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/50089923144.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ck88v5lq1ve6vu932sgnjch40s/warikefojizow.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96306283861.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/pubanijowokitalazok.pdfIn PDF document text
    • http://hak-al.com/resimler/files/14523619549.pdfIn PDF document text
    • http://proxima-online.it/public/file/40626903757.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/suxatosiwakigefuvera.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/xivelulurir.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hjajcmlob3gtj93bmpd6e3ckqh/xujilojazekaw.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0b438472b---xopawogadidelimetomej.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/12513244164.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/5276993395.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/tesulevofakiwilavabini.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f81db9dbe---sidonoxapi.pdfIn PDF document text
    • http://castel.lu/userfiles/files/fimemuxuga.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/65985790111.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/xovatufozodilipeb.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_off0000be9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B4 11008 bytes
SHA-256: 96ece1357b6422b7b94ad4f027ddf57c43ec84c6682ef6ed3263dabe18a26700
font_02_sfnt_off0000efe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 17468 bytes
SHA-256: 842122f43d9c7aeb5a60e889313641625d8c54b71641270378e9c8acfbdfdf14