Malicious PDF — malware analysis report

Static analysis result for SHA-256 936f9ae4acc81e40…

MALICIOUS

PDF

84.0 KB Created: 2021-06-27 16:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86e868e803d8b6e5af99e42e2a0d179f SHA-1: 35ac5fafae4c583f737da5aa34b02e1dd28b397d SHA-256: 936f9ae4acc81e4042ce82ed692f72fa57552f102ddacd8b240c3c1786266710
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jtour.vn/userfiles/file/29446708407.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/3ha2hfnng63ciudebmpt1furhb/60370925881.pdf
    • http://bc-arman.kz/ckfinder/userfiles/files/jodevak.pdf
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kudirigub.pdf
    • https://mszukam.pl/dat//file/10936272950.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aac81fb4b3d---xigisexeve.pdf
    • http://apsons.eu/files/file/gejilijetarowejoxegozete.pdf
    • https://hopadive.cz/ckfinder/userfiles/files/pokelezevorawad.pdf
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/35411634462.pdf
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/sozem.pdf
    • https://aterhesseg.com/up_image/file/72531164788.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/edfb608a9fcc52d45b573fb8131d0b42/42685881006.pdf
    • https://ajansnigde.com/resimler/files/rilitidavoso.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/cdbecaba4a14413c5e7928c1304e10bf/nogoxibomido.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092ebcdc26ed---mujulavufubulepodelu.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/teaan8l9fn64u8d5o433v08uer/70554405039.pdf
    • https://naoshima-habitant.com/41030114830.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a19366a4b---43214478989.pdf
    • https://dacinsara.ro/fckfiles/file/pijagokusetipilixiwuked.pdf
    • http://azizolace.cz/images/file/32269946077.pdf
    • http://obasekiestates.com/UserFiles/file/25479811625.pdf
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/dupetusopesitunaramuxewur.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/582b291e996607bd626a0ae31990ea6e/17608427786.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a1eada258---dozokuwajiziwa.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e52ca2dad---jutapanapuzibupovizamuku.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=irs+form+schedule+b+2020
    • 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_off0000e588.bin
399d76889ae8b3ede8538ea08994bb3f022e6052ade68ab0f86bd1a2dc1dd5b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 10716 bytes
font_01_sfnt_off0000fe22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE22 16792 bytes
font_02_sfnt_off00011634.bin
4efae15ab0d3cad26891f0717a0750e0bb26439fd4be8789453d707379aa2c9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11634 16956 bytes