Malicious PDF — malware analysis report

Static analysis result for SHA-256 747a09ea47e2a1a4…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 03:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6a86f1435377a28d020b6a479deba406 SHA-1: 93710d7ecdf86662760d00dfd50b74f75b6124e9 SHA-256: 747a09ea47e2a1a4a43ac57fbec8d380f9d8a4bb63bd10bc62a4558c172fc091
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, some of which are associated with compromised CMS uploads, suggesting an attempt to obscure the final destination or leverage compromised infrastructure. The ClamAV detection and ML classifier further indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://geose.ru/userfiles/file/tuvivaxamelisibugogutuxop.pdf In PDF document text
    • https://tradingphrases.com/userfiles/files/nezitemelebozelar.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/bebobajakumekezepe.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161426dec35412---xumiweralebow.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/45419625404.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161397f96434f8---veleguleteda.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/69387202743.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/36183367302.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/noberakawuwagozewexa.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/12215557081.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/wibobusul.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/99553855366.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/vofeduxupon.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/91473615284.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/4078048357.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/sonosaxitikitirosudi.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/waxoxirofi.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/71ce9149c9a99bc53bfc20ac22511c85/85813355427.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/82ec5aaa178f516c20ea3f1c69e14acf/vubononurexona.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/54653091234.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bixijikatoxuposudupotegos.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/8623060536.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/64915147587.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/temotuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=install+android+apps+on+new+phonePDF 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_off0000d876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD876 18760 bytes
SHA-256: a6a3196a0c661bbdf6d96acac01e3899ea647f8060a4102454d630099a2e6483
font_01_sfnt_off0001098c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098C 10528 bytes
SHA-256: e98ca760c7bfb0cfd5c379756094c56e524ea3c6503076fb9342a53da54d5044
font_02_sfnt_off0001217b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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