Malicious PDF — malware analysis report

Static analysis result for SHA-256 608272e4dba2379e…

MALICIOUS

PDF

69.7 KB Created: 2021-09-12 05:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bcad3a31dba55d40566d3115d14a2f3c SHA-1: 80a7525d662cee759bcf0796f2f81c24e49cc3b5 SHA-256: 608272e4dba2379e655cb8bc794ebdc657df25216cf7ab60b0fe7e4b41fbcbe7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript indicates it's used to facilitate the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613552cfa2b1a---67424147351.pdf In PDF document text
    • http://cluboutletmoto.net/campannas/file/61472166531.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/38783706558.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/nipebukavifeko.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/suselafunizegupivemowuzuw.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/sijumiwozijojenija.pdfIn PDF document text
    • https://arendic.cl/files/20666543527.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300e0d3afbc---39151134885.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/buputivejamisujawasidali.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/ridovumuseditonuwoxo.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/gutonure.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/tavosu.pdfIn PDF document text
    • https://cecprint.com/images/file/detixojobe.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/mebaxitesaninumalegizudib.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/49450799746.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/9550785682.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/limuganuxojen.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c96588fc53---80007057042.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/33328616045.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e354ef21b---noxopurolumiduvuligu.pdfIn PDF document text
    • http://merwepizza.com/upload/file/sosuzulaxadobakopitubib.pdfIn PDF document text
    • http://royalgroup.at/tmp/36548428110.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/4d2f415d5058c1084eb9a45442bcdf3b/dotij.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/50226654155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=download+sex+android+gamePDF 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_off0000b357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6E 10684 bytes
SHA-256: 066359744b42c0d5661d6956f415ef301c4d571c5ef4b6416c5cb43f20da6cac
font_02_sfnt_off0000e3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B7 14976 bytes
SHA-256: eb684ecad2df8abc20bdac9a72aee0d3896d5892f29aaa27a4776ede7a633935

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