Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ca856a9460a68b…

MALICIOUS

PDF

75.7 KB Created: 2021-09-11 18:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fc13bbeee7c1a053505af5d063cba883 SHA-1: f58bcce48d8a57773d9a3943faaa4250fb790bf5 SHA-256: 86ca856a9460a68b7cc79a036957ebaa707f574b85a764a4d51dfbcf46612b13
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 executing malicious code. Heuristics indicate it functions as a link farm, pointing to multiple domains, some of which are associated with compromised CMS uploads or disposable hosting. The embedded JavaScript likely facilitates the redirection or payload delivery, and the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://athaj2.specialty-match.com/upload/files/82022812066.pdf In PDF document text
    • http://chickenwild.com/upload/contents/images/images/gilasanidijimida.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210908005324.pdfIn PDF document text
    • http://skupka23.ru/upload/m/74395493684.pdfIn PDF document text
    • http://talesma.com/E/file/tujisemarulokeminedis.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/46534786614.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/murafosiriguvixaz.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/nakibafetazewapofete.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/14e69c8c719b2c995e88bec019262cff/12325964045.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc89586cc5---nepopumuwesosib.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/kofutipok.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaa0e944be---kebot.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/7310268371.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210907201643434088w8nre8.pdfIn PDF document text
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/31999038805.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613817611660d---56579792525.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/80949020434.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/voxoxubew.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/95106947335.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/kajobo.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/fesadezelowusedevib.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/95509304186.pdfIn PDF document text
    • https://afayl.com/userfiles/file/14828940004.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/8158621144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=fantastic+fungi+123moviesPDF 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_off0000c1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CF 17792 bytes
SHA-256: 8437650a5f806d98c4fc35a054f68766e38a029882264aa1510c6a48780df43e
font_01_sfnt_off0000f000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF000 11020 bytes
SHA-256: 01d1b52cfdc84cbda10e83272fb05258599dde92fd4876fc1a9bb28ab4db6745
font_02_sfnt_off000109d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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