Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a234608d3f6c53…

MALICIOUS

PDF

75.4 KB Created: 2021-09-07 00:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eac6713c9dca0167d2e305d86f0a4094 SHA-1: a3df226c2bdb3c768d7720d6850899d50c8bc250 SHA-256: b0a234608d3f6c53786b4241d1fc0d82f985f6c0143e844435c0331601de801e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://garglob.ru/uplcv?utm_term=parasitic+diseases+of+animals+pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/sg3q0v48q3k9b4jpcufieidgv7/viwuvojovaruxofaxenikivad.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b4d5eb0f7---tisug.pdf
    • http://radio-salsa.fr/php/rs/filesupload/file/58651307288.pdf
    • https://ahreco.com/uploads/news_file/wabifapebixiwegatemikudos.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160967d39b9dbb---rumabezigapi.pdf
    • http://www.look4job.gr/images/_user_na/file/dolizugebudiw.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607328ccb8d37---66455258675.pdf
    • https://bd-sokolovska.eu/userfiles/file/wipamasolapumazopufoso.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d91e0ea72---pevijebesuzajomojuwamo.pdf
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/sovavowadorim.pdf
    • http://yokosohk.com/files/fckfiles/file/81484559061.pdf
    • https://travelsafeway.com/userfiles/file/77359573970.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/f7c2119d15d601e802b15b9452a03000/70525606618.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/nha526aqgmjvb2cffdntfnjea6/87891749692.pdf
    • https://suprizpin.com/calisma2/files/uploads/fuvobazoluzikamuzu.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083390305112---78380990000.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/j0l0dd5j50gf7ra6fscms62h3u/17159088973.pdf
    • https://aartipalette.com/userfiles/file/58877829001.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7a8b374bc---rurufebazipetupopewet.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4a4e6cee6---60916565434.pdf
    • http://planet-for-events.de/userfiles/file/63256308878.pdf
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/85303943888.pdf
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/vijesidijavemeba.pdf
    • http://jubileejec.com/userfiles/files/vojipizokegigebuki.pdf
    • https://noihoithanhtuan.com/media/ftp/file/56083964370.pdf
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/pezuzalosev.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_off0000c392.bin
ab544bba7c7405d54122f24ea174be522cde1c9b37f3d1002a0101d7dc6d5571
pdf-font-stream PDF embedded font (sfnt) at offset 0xC392 10780 bytes
font_01_sfnt_off0000dc5c.bin
bceb2b7c8a3190951776786fd6a4b813d52908b2bc372ccce8323480135ecc55
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5C 16912 bytes
font_02_sfnt_off0001079f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1079F 16792 bytes