Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e386dda6935e5de…

MALICIOUS

PDF

94.7 KB Created: 2021-07-21 02:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f35d779a44ac245919b8eb08972b3006 SHA-1: d4da2bf6484e093a84794de4a375f19fb56332cf SHA-256: 0e386dda6935e5de8b56c3ea240b76b816929cc4e32c41bbfd5bd858c7d6e292
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also hosts a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/38561237638.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/isve201cef8ennp0j84rn6t5e2/25425075288.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/bbf841c6c488de21d4d49b3c4adbdbf3/8212484707.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/bbae05591d4fdc7f4069f6e10c7eee80/38113580046.pdf
    • https://wipaphun.com/UserFiles/File/bugovojedomutapukedexos.pdf
    • http://jjinline.org/file_upload/file/bamivema.pdf
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/demorewukaxuxonadaketeru.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/876210d012b82455b4330a39cde78547/29457509742.pdf
    • http://charivne.info/images/file/rimejegi.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/80a951cc7c2bd6cf242df9c88b4153f4/vuxizep.pdf
    • http://arcenevents.nl/site/upload/files/zepunaxesile.pdf
    • http://irk-yoga.ru/upload/files/fusenodifen.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160941d47ebfd3---kapejukimobema.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94180316b---tuvarebivazowakiludezuxam.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/ne8e7bkqq2i89af91rk3g9ujs8/58245112427.pdf
    • http://novafish.it/userfiles/files/35958228966.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/15f135b4b4241c5c914922eeab35a8af/44635547718.pdf
    • http://www.alfapilates.pl/upload/file/raravikegun.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebce177b55---60260081155.pdf
    • http://onlineexpert.in/userfiles/file/zumuga.pdf
    • http://coronado1977.com/clients/54390/File/55302382910.pdf
    • https://bandai-k.com/userfiles/file/fexuvo.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac9bd21af3---88367062261.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/1bf70b2fb3316d690d68aaf66153f26e/92112990508.pdf
    • https://stancijanegrin.com/UserFiles/files/tisutoxov.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160705a66a00e6---nimuxovenomixis.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=raya+and+the+last+dragon+online+123movies
    • 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_off0001005f.bin
ec4907177202564bdc7fe606d92bedda0006b7545a78a1830bfe9f8a63d47926
pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 11264 bytes
font_01_sfnt_off00011a8d.bin
7115203c9f3c35d0072323270616dc17e9aa2314b41805693aa8f8d04b62bb25
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8D 21892 bytes
font_02_sfnt_off000152dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x152DD 16792 bytes