Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a89324dfd88747…

MALICIOUS

PDF

87.1 KB Created: 2021-09-14 01:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 293cfaeb3ecd50040a7912a5ac032539 SHA-1: 711ff67aada1cecc6b494d3ceaefbbfd797d594b SHA-256: 08a89324dfd8874705bf6233af9afb739c5adaf613819d975ddef2217490c8b8
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains embedded JavaScript and multiple URLs pointing to compromised websites, indicating an attempt to host malicious content. The 'Remote-support tool lure' heuristic suggests the document's content is designed to trick the user into installing or running a remote access tool, likely to facilitate further compromise. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b791e768bf---92800683900.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecb80c0a57---76951984274.pdf
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/21916849197.pdf
    • http://doctour.hu/uploads/ckfinder/userfiles/files/malawiduwajov.pdf
    • https://wintechindia.in/ckfinder/userfiles/files/64428264052.pdf
    • http://thietkewebbacninh.com/webroot/img/files/gugosuzofef.pdf
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/60539067009.pdf
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/sutafefexisowitagukeno.pdf
    • https://pfhotel.gr/ckfinder/userfiles/files/20021981559.pdf
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/fogaz.pdf
    • http://dinskayarealty.ru/media/file/wagakipopotamobewiz.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/252fcbe2da63fc12b1521ec35b5ab7a5/taxiruro.pdf
    • http://otestmanager.com/club/data/userfiles/file/20210913182131.pdf
    • http://enjoyisagenix.com/ckfinder/userfiles/files/xenaxikofisabopevaje.pdf
    • https://bachson.net/upload/file/nubazapiwiderun.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613741359253d---xomogukegidewemige.pdf
    • http://ansonseatery.com/uploads/files/vinaxatamififezobez.pdf
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/76439748473.pdf
    • http://www.salpasafarit.fi/tiedostot/files/bufadew.pdf
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/xukuxesubu.pdf
    • https://jotekonybakterium.hu/userfiles/files/58034186616.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+erase+bluetooth+devices+from+android
    • 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_off0000ec75.bin
afb94b6bd828a8752a8873a2afd7b99bf5b0a1668c00305c4196dff4d1869bde
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC75 18488 bytes
font_01_sfnt_off00011ce7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE7 16792 bytes
font_02_sfnt_off000134fe.bin
e55d0cc70a769e59b3092bfecea45878f102acd0cbd715b7e6345f11ca996a64
pdf-font-stream PDF embedded font (sfnt) at offset 0x134FE 11124 bytes