Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3d9854a8e1fc03…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 11:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ee3821c2b8235a6adbfe96e377a6078e SHA-1: 1452362a188ee6423b57a112e32421a02c73fa37 SHA-256: 3d3d9854a8e1fc0395ade8f6d3d7005109f90ddb1b11d4de05ecf4f6ab8a7412
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The presence of embedded JavaScript suggests potential for further exploitation or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://sanyosushiglendora.com/uploads/files/kelotatutidixinisulomovof.pdf In PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/3c226e1ea5ecb6ce9cbc13e4e786d496/latusepu.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/vesuwojugositigi.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/govulixukomodulubago.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/6325556887.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210907130007.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/kusaxutekuwalarimevit.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/63926457926.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/62688358232.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/deralarowazonazapomulax.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/31536114975.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/42606840358.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/16667539113.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/wosuferodur.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/tabevisevalogugefiris.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/79158511597.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/2qk4v2kan3tgfok1q594epto7e/joxowukixesimuvut.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/28421595569.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3a1ddf7b4---zotubesixo.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/bonapimokimagiv.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/30052306820.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/17819291008.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/ba2b29275f4452cc142fa1c13c771027/kivatefesog.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/xogedefazodapoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sanam+re+full+movie+hd+1080p+download+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_off0000d9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CC 17536 bytes
SHA-256: 52f25d061e158c4e6076ff9fd76a2a888ccbc75cd37584b6f64625df2538c6aa
font_01_sfnt_off00010712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10712 11204 bytes
SHA-256: 6e590d7cc9f005ba3846979e1b3a86897d324257ad36991498890d4f64dd75ea
font_02_sfnt_off0001211c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1