Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66d76eb0f05e39d…

MALICIOUS

PDF

70.0 KB Created: 2021-09-20 22:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2f5f9af08e7166da9c657f88d0b14743 SHA-1: e210d757873ce72ead65dc58f2052ae55f547e2e SHA-256: a66d76eb0f05e39d6976362e068ce691c2bb0825f6ca6e259fffed312460a6ec
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The primary purpose appears to be to host a collection of links designed to lead users to phishing or malware-hosting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://goodluckfishing.com/ckfinder/userfiles/files/litukobesaloziladiguvepap.pdf In PDF document text
    • http://bayernglobal.de/userVZ/file/vurenadirodexo.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/2189183927.pdfIn PDF document text
    • http://pbpharm.com/upload/files/74703531769.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/2553586994.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/kizoganeteladi.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/18458387133.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/wipem.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/71914478227.pdfIn PDF document text
    • https://southafricapools.com/contents/files/13107971792.pdfIn PDF document text
    • http://indemo.pl/Image/files/wifagitakoxuvafu.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1632157651.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/488496064.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/ee34e86c5876ffaf8d684429d909521f/fuwujexejorodadutalisoz.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/zutifovure.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614166ed84ae7---69619340024.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/84962484019.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/foliwi.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/zubajurevoluboxitet.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/34472664141.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/tefapu.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b59a69ea56---68562110748.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/ketexuxuzuz.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370edecd037---82429874406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=it+happened+one+night+full+movie+freePDF 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_off0000b518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB518 10892 bytes
SHA-256: a6e440388cda73b1a2c43532bba42c887fe680b24a892380f375b9e7d01d3c06
font_01_sfnt_off0000cddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F1 14520 bytes
SHA-256: 8457ef6cf64aba85d666ee7f4c4048d87355264fe0dd14b3dd79a7fa616671f7