Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a142db19734d49…

MALICIOUS

PDF

94.2 KB Created: 2021-09-05 02:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cbed9b5d5d97b2129b92e1191b2e2c21 SHA-1: ef56c99e29c0dcc801b48ea94c4f92d948dd3f17 SHA-256: d6a142db19734d4949f1f58369055b4639572753cdf6d220fd93f6813f44eec2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure indicate an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://huntic.ru/uplcv?utm_term=gateway+2nd+edition+a1%2B+teacher%27s+book+pdf PDF link annotation
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad17cd81e1---sabuzuvezodoje.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd85f6711b---tifal.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/dizejulesebape.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/nowomep.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd47def09d---58606499323.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/e3k4qu09nso15j7mqh828k7jb5/ginewonopu.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/redofosubok.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/30590945431.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/86183639993.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/wufosuludi.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16091ac7e663f8---6076230831.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d27de5ca2---59094113348.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/gewixexidoma.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/bopavawogadat.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/94372415046.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c74b992d3df---35689377182.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/simevigujarizolos.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/fibitowakolijeg.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/64350991530.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/tofelofidexasabesavaged.pdfIn PDF document text
    • http://juha.be/_files/file/lubezewurivagulogasapa.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/zomoruno.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/717235a22f13ddc434efb850fee3c5f6/lisarezabukomixodatanuto.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a17599b5a44f963d1dbe25ea53fb663b/wenepefewunepewadow.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c090e001e9b---37321093256.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE28 11348 bytes
SHA-256: c61028d2121f854394fb5d30d9bc2fd511772224d2e98bf8b123d2aee2507832
font_01_sfnt_off0000f8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F3 17076 bytes
SHA-256: f790556cc262592240c6e4dc2d98a89647a8cb2ead43ac86d59e61b8e1906d99
font_03_sfnt_off000129ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EC 25532 bytes
SHA-256: bf06eea11cd3acad26efed057a8a45ee4f6c6b49c6243692799df583be85678f

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