Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46570893569d834…

MALICIOUS

PDF

80.3 KB Created: 2021-07-27 23:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6ae11a202ef072e914570449ecd54de0 SHA-1: 53d56309f426a97b95be1c8ae807bb60deb292b4 SHA-256: b46570893569d83478ee496e06bc4ccc4d564ea24413f4a918b5fdc56e69c4b8
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No specific family could be identified, but the techniques suggest a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://qfuse.it/images/uploaded_files/ckfinder/files/1624510226_c9e06d8d38.pdf In PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa09f265620---85567491722.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/78377362472.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210630075801.pdfIn PDF document text
    • http://chromavials.com/d/files/bureparagebile.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/7558840064.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/tezapaval.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/65006483874.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/7ae6c64f0672beea91e13dae8e65024e/74583596238.pdfIn PDF document text
    • http://446888.top/userfiles/file/vukojakasigagukotuk.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/7a528104a30a21f69994acd49c53f9e2/bemesesimunojudiko.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa9d79d0fb---vajodesiriluriwomozuwam.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/64813734520.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5b25751a---tozokobevinegaje.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/kijezufuzezujukubavi.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/35081668397.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///kuxojoxivoribepiwa.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/detolifekifupew.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/saporiritesi.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/98427690462.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609871eb01d14---55954753856.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/98216238117.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/92032089233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=absolute+java+6th+edition+solutions+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/sivojemakusesosowepewane.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_off0000d6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CF 16320 bytes
SHA-256: 247923b1af6bfdfdb7a725a7de20190d89df651c99c1f66ec4a792af4eb2c523
font_01_sfnt_off00010130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11947 11080 bytes
SHA-256: 794805bd70eddcb24ae4839013aca7f7bfa5971137525aefcc9837e296b1abb8

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