Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a61217f26239ec5…

MALICIOUS

PDF

76.6 KB Created: 2021-09-15 14:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5eb24cbf11003a86849197140dbe7ed5 SHA-1: 32773d33dcc95e396ba5d8a377b854998f4f257c SHA-256: 3a61217f26239ec5150872f931fc2a8280f555ad5be35ee41d9aeedab78e7152
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs pointing to external websites, some of which are hosted on compromised WordPress sites or disposable domains. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crewmak.ru/uplcv?utm_term=lemoncrest+android+tv PDF link annotation
    • http://sweet-sugar.de/images/uploadedimages/file/44167708802.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/43855227695.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/14990040526.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/74319706201.pdfIn PDF document text
    • https://senegal4d.com/contents/files/33916627098.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f944cbeebd---80505239532.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16132e417498e9---50287468443.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613789883f1f5---50589074823.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/63616736158.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2f2ec8f38---riposegujadasupidu.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/wikobumexapabiz.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/20280579104.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/39480511591.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c2d0691ed---32705513557.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/21407132309.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/cb93799d695bcc9eb2b09493ced5e814/15316743982.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/26861877154.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/bisepiwu.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/wumawutikadew.pdfIn PDF document text
    • http://hingliltd.com/userfiles/88975443693.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4a4f4bd49---38468257944.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16140266eeb1f4---depegewejolivoba.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_off0000c74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74C 10508 bytes
SHA-256: b855bc82d08d9b129f1e0a19fba5c5a86fa9f210802cc5ba0b0a7f46174c7d72
font_01_sfnt_off0000df36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 17632 bytes
SHA-256: 39cfe6bb08dae9735183e7fefcd5c49c772cc6f0ca76f617e9fce18ef368a8da
font_02_sfnt_off00010d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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