Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16e7af87660fa17…

MALICIOUS

PDF

91.9 KB Created: 2021-08-02 18:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 86ce155430663fa64a0a907d0a107715 SHA-1: 343a45cacf6d92366efdb2bc372d1c2335597cd0 SHA-256: d16e7af87660fa1770c7997447629ec7310ba08d591e04e003778df277ce7ce1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It includes numerous external URIs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious hosts. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • 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://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/b355170667901089bfd33f983632ad61/vinuvaluke.pdf In PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076324166ae6---31751250418.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/35583255804.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c791484a80---35113897261.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c34876384---vexeredimijo.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210619022528.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5231290009---33035862589.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/8594747999.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d545b83726---64444463740.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/55570381083.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a16a2898d5e---nivekapagiv.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/bibutukipipitin.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/33585702550.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16072ca48d3896---sidemidatamikixif.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/73004474208.pdfIn PDF document text
    • http://fygl.net/uploads/file/27165854846.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/21127020331.pdfIn PDF document text
    • https://tmtteks.com/files/25503021019.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/7f8be23f2b39a55de66e50fb6b880471/79384385955.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/v27i1hdho866mq8qt5kq3681oa/visesulakuniraperut.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/legolsnt003firdmlupu7eu5uj/39727092331.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/o0e7ps77j1o4ouok21andk8g1l/31920818390.pdfIn PDF document text
    • http://hondaotohaiphong.vn/upload/files/48528924796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pearson+precalculus+textbook+answersPDF 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_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 10796 bytes
SHA-256: a7e2d2148e2a791e1da7dbaa45a268f95ecb498d923e77da59cb7c0dbf1d463e
font_01_sfnt_off000114e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E6 18848 bytes
SHA-256: 0164a0c12e988766b3174b3718df310ede529b51269c2736237792100ece96fa
font_02_sfnt_off000146d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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