Malicious PDF — malware analysis report

Static analysis result for SHA-256 990f889ae41da118…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 07:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28bec271cf90dc1cd7f4e4edf55622cb SHA-1: 1e73da85ddb9471ff3bc8ed44ed3a4245401726a SHA-256: 990f889ae41da1183965e9934ca1b51812287ce0d7fd5fab686171c9e517f8af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URLs, many hosted on compromised or disposable domains. This strongly suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://crysiq.ru/uplcv?utm_term=voter+id+form6+6+pdf+odia
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210601080314288781t6h3bh.pdf
    • http://detikakdeti.ru/img/file/18703598761.pdf
    • https://247christianity.org/fckeditor/userfiles/file/monina1621466759.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec7e99fc14ee4da92bf0308f5f5f70ec/15485248363.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/3qc78dme660uu611mdn6oen5ep/lugupawog.pdf
    • http://fygl.net/uploads/file/110947075473.pdf
    • https://singlespeed-switzerland.ch/userfiles/files/63654925180.pdf
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/pekobixajemapijulol.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072389c0170a---75137274043.pdf
    • https://aspit.ro/imagini_ws/rudutonedixatemex.pdf
    • http://provia-events.de/pics/fotos/1/file/vipefog.pdf
    • https://victorybear-info.com/userfiles/files/61391990444.pdf
    • https://shop-ecobati.com/medias/upload/files/29357468206.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/82982f3b85ae072669caa0ed7200367e/70454979607.pdf
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210712092723.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987ec62ad18---rilesovadenexame.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2a57dfe93---63268849243.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608616f560f6f---powakaxa.pdf
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/
    • http://natproperty.com/userfiles/files/rajomukojali.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/8a004ab81a304b670b0ec0ea8510d9d7/gejopawewegopekofizani.pdf
    • http://allamericannursing.com/userfiles/file/wemavif.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/76fb09cb7f15cae2a57c4f3acc6e777e/14147748350.pdf
    • http://www.gamylai.vn/uploads/files/50332657155.pdf
    • http://www.w3.org/1999/02/22-rdf-synt
    • 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_off0000e8aa.bin
0ddf97a8695aa522ae313716a4573d0d371edd72433d10a012e6467ee0a5aafe
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 10480 bytes
font_01_sfnt_off00010086.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10086 16792 bytes
font_02_sfnt_off00011898.bin
a7fdb98988e96f118d4053001ba2cbe284f6070aefbfd56ce4bc80d968df9abf
pdf-font-stream PDF embedded font (sfnt) at offset 0x11898 17764 bytes