Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e1309c816050ed0…

MALICIOUS

PDF

84.9 KB Created: 2021-09-13 09:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c60619289f156e47cf5d94e11da3a549 SHA-1: a25c56e4dbf9c85ff67cdcd4d151104ebadc66d7 SHA-256: 9e1309c816050ed0066c0f8bd6db96bc6e471835a670d7182c0a6bc40be8cd76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The document contains a link farm with numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to direct users to malicious content or phishing pages. The presence of these links and the overall structure indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6e6b8ef74---kimogopasejinezu.pdf
    • https://gtselect.fr/ckfinder/userfiles/files/56581158704.pdf
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/luwaber.pdf
    • https://polenhosting.com/calisma2/files/uploads/xazowibazetadeganup.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/90525a8205b6f9a4051b4c11f569fe00/20279897928.pdf
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/21176866467.pdf
    • https://cape-electronics.com/media/file/vewedofumulanasudetezi.pdf
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/tolutar.pdf
    • http://zulassungsservice4you.de/bilder/file/pobasopikuvupununuvedeju.pdf
    • http://binhchuachay.info/Images_upload/files/luzozuz.pdf
    • http://refinerlink.com/userfiles/file/wawuxatugam.pdf
    • http://agriturismoilnoceto.com/userfiles/files/butevufok.pdf
    • https://tradingphrases.com/userfiles/files/rabobo.pdf
    • http://stlukesfp.org/ckfinder/userfiles/files/58723811066.pdf
    • http://linpus.com/app/webroot/userfiles/files/valekudugujebogunujufal.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353d42666c2---68409188275.pdf
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/losurujozoz.pdf
    • http://sdes.in/uploads/fogalulam.pdf
    • http://dep14kirov.ru/userfiles/file/62625147114.pdf
    • http://jtour.vn/userfiles/file/rosoxubokegazojiwamojemit.pdf
    • http://giaydantuongphongngudep.com/images/news/file/nadifofijamobobumebeji.pdf
    • http://sportschoolindex.nl/images/uploads/mepukuj.pdf
    • http://menifee.hanasushichoice.com/uploads/files/93280446724.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=buypass+app+android
    • 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_off0000ea51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA51 16792 bytes
font_01_sfnt_off00010268.bin
ac0e26c4b4d7ef92866c1549ddae69d3728ac2a69b2032f09276e296723b6d51
pdf-font-stream PDF embedded font (sfnt) at offset 0x10268 10376 bytes
font_02_sfnt_off000119f3.bin
50717a25ad988355662b01ca934bd5cbd09f06a703da0cda367fececc10f7a2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x119F3 17236 bytes