Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41e358ca454286c…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 17:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 798f40ded4c826781ae41bad137476d7 SHA-1: 0181ba5ad4ed2cde9178859ec1b07d3ea1fc7855 SHA-256: c41e358ca454286c5f0c2efa1d9ae6fafe8bd024fcbece8494bb294d5979e56e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of embedded JavaScript points to potential exploitation or further malicious actions.

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://hoangle.vn/uploads/userfiles/file/11340145487.pdf In PDF document text
    • https://songod.vn/uploads/image/files/jeminakexamijatemafopubu.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf9c3b9958---kizowopi.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/67792778152.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/rarovebitexefi.pdfIn PDF document text
    • http://ruresept.ru/files/file/tofojaxisatonis.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323695145d6---38463282032.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9fad9a5305fbe1c023bef52c2d1f0933/68243943502.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/sabexigepa.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/zitumegusefulewufaviwar.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/8b15e1b6bff0b54a91f1c7da3d5ec0fb/fivitixupuzizulafonuboja.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/97652256732.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/68769147921.pdfIn PDF document text
    • http://topflexsports.com/uploads/tajubokakun.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/tiwoku.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/wosojomufusiz.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/tubuworinid.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/kupuzozupina.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/f8oni6jdaic8tmuu3tj185fij1/dewugotoxibolepuv.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/joxurolenuw.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/38215964849.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/tipuzopo.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/zipamivom.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///somus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=minecraft+mobile+pocket+editionPDF 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_off0000d6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B0 10840 bytes
SHA-256: 9782cf49e7e66e234ded665afc44c8403b753df756b54a61c9771c2e99cf91fb
font_01_sfnt_off0000ef70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10782 18548 bytes
SHA-256: 51124a9bbd4a28d217ea2b2671b2d78e917d39e2afcc829051287bc5718bd5f2

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