Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6c291a41d2b3d5…

MALICIOUS

PDF

85.8 KB Created: 2021-09-18 20:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5da6385c42c4f255808fae41cb49d10 SHA-1: 481c97b1c03e982dffd4833908e33ca7483c7ef9 SHA-256: 4f6c291a41d2b3d53abcad1556640421e56b1e6b023d1c492f40f1af2a551f72
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS upload storage or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=transfer+apps+and+data+to+new+android
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/gasovifizekajaxe.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134379a292c5---81868155668.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613372495d3c8---zopisadodekef.pdf
    • http://traktor-tv.de/sites/default/files/file/49589254333.pdf
    • http://bukhatirhomes.com/userfiles/file/bugodox.pdf
    • https://wisestudentz.com/userfiles/file/gopofagivukiv.pdf
    • https://misbahelmudii.org/ckfinder/userfiles/files/sobavanakaduma.pdf
    • http://www.amedna.com/userfiles/files/29384728842.pdf
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/58178908469.pdf
    • http://otvorene-srdce.sk/userfiles/file/41476067740.pdf
    • http://houselandia.ru/files/texodegadelixexifubapakuv.pdf
    • http://yuilchem.com/userData/board/file/50377612495.pdf
    • http://yurisolomko.com/userfiles/file/58968696989.pdf
    • https://indirimlipin.com/calisma2/files/uploads/61028669393.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130775e8e14f---biporidatome.pdf
    • http://jplus-ag.com/upload/files/BodyFile__61354500A0400.pdf
    • https://noihoithanhtuan.com/media/ftp/file/najakedomuvisugapi.pdf
    • https://0955205219.jwa.tw/userfiles/files/ponewilaxopajeresejog.pdf
    • http://dafangtour.com/fckeditor/userimages/file/20970473117.pdf
    • http://bluecars.pl/userfiles/file/99380645661.pdf
    • http://laxycoffee.com/upload/files/10467639745.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/c1273vihe0ienc9lpvglj15pmc/70578051806.pdf
    • https://publicbridge.pl/userfiles/file/3948995414.pdf
    • https://bloomlight.pl/_bloom/file/9454196931.pdf
    • http://siripanyalamphun.com/user_img/files/80378503399.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec00.bin
a675c3a3b61a86f3ab315bd6c77472dd8cd55cf946b1afdc4c8abe2324284e70
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 17276 bytes
font_01_sfnt_off000118c7.bin
2422e9822e0f8b0b90a1372134b2ab40845735d9e04f23ff25c2f29cbb321e98
pdf-font-stream PDF embedded font (sfnt) at offset 0x118C7 10492 bytes
font_02_sfnt_off000130d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130D8 16792 bytes