Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0488c49f36aef2…

MALICIOUS

PDF

96.0 KB Created: 2021-07-16 08:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69ddc1cf082928b3bfaa6adccb366a29 SHA-1: 18f41e00c7724b5db023161341e67bfaf5e7cb42 SHA-256: 8f0488c49f36aef2e453113f65f2869c9075a005345df741ba58fe69513a8144
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://funkyspa.net/ckfinder/userfiles/files/dirani.pdf
    • http://7tec.ru/userfiles/files/misideruzidag.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160702eb5e8acd---45076519714.pdf
    • http://www.contectrade.hu/fckfiles/file/dutivijozowotisafosi.pdf
    • http://ecohouse-lab.com/userfiles/file/jozezugulilano.pdf
    • http://anaminfo.com/attachfile/file/pelonigenovajemapo.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160716278923d5---xojegijexatuwufebafi.pdf
    • http://outspokenholland.com/userfiles/fckFile/20210523022514.pdf
    • http://gorisum.net/fckeditor/upload_file/file/fekerigosojipamapeki.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/6b367dd5feec9e7955386a26d0d2996c/fobigunizabepi.pdf
    • https://educationindiajournal.org/ckfinder/userfiles/files/22902780718.pdf
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/sidavilexazamux.pdf
    • https://fenixfalt.com/userfiles/file/55976751204.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/7a8b6457b500731f3df430997524020b/62980571052.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/gdb426gtl1lh3eues7t0d701mv/2891790382.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/5v5086r0q0ri15oaevdprkdc14/mejenedigaduzelaluduv.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c72497875c345fbe7ac24d00c2018b6c/40641221317.pdf
    • https://lescourailleurs.com/upload/editor/file/54569048056.pdf
    • http://xn--b1akwe.xn--p1ai/userfiles/file/95228587193.pdf
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29212572726.pdf
    • http://stratford1980.com/clients/1/19/19838be1bbe5684469623718d5e25b5d/File/11553545239.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fc541dcf9---timotazatere.pdf
    • http://rotarybrescello.it/userfiles/files/59463256655.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=parse+integer+to+string+java
    • 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_off00011264.bin
9e3bf425b52d4582ebd0d021b5f0b225aa1c7187a3f8d035070480a20446b942
pdf-font-stream PDF embedded font (sfnt) at offset 0x11264 18348 bytes
font_01_sfnt_off00014328.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14328 16792 bytes
font_02_sfnt_off00015b3f.bin
b7bb94f5121a3844056f49dc130fe5b0a6f3477438d6e15b00caee358f5cc925
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B3F 10436 bytes